DEFINED ASSET FUNDS MUNICIPAL INVESTMENT TRUST FD PUT SER 3
485BPOS, 2000-05-17
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      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 17, 2000

                                                        REGISTRATION NO. 2-88326
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549
                     -------------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 14
                                       TO
                                    FORM S-6
                     -------------------------------------

                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2

                     -------------------------------------

A. EXACT NAME OF TRUST:
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                                 PUT SERIES--3

B. NAME OF DEPOSITOR:

                   MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
                           SALOMON SMITH BARNEY INC.
                       PRUDENTIAL SECURITIES INCORPORATED
                           DEAN WITTER REYNOLDS INC.

C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:

<TABLE>
<S>                        <C>                        <C>
 MERRILL LYNCH, PIERCE,
     FENNER & SMITH
      INCORPORATED
   DEFINED ASSET FUNDS
  POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051                              SALOMON SMITH BARNEY INC.
                                                            388 GREENWICH
                                                         STREET--23RD FLOOR
                                                         NEW YORK, NY 10013
</TABLE>

<TABLE>
    <S>                          <C>                          <C>
      PRUDENTIAL SECURITIES
          INCORPORATED
       ONE NEW YORK PLAZA
       NEW YORK, NY 10292                                     DEAN WITTER REYNOLDS INC.
                                                                   TWO WORLD TRADE
                                                                 CENTER--59TH FLOOR
                                                                 NEW YORK, NY 10048
</TABLE>

D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:

<TABLE>
<S>                        <C>                        <C>
  TERESA KONCICK, ESQ.
      P.O. BOX 9051
PRINCETON, NJ 08543-9051                                  MICHAEL KOCHMANN
                                                        388 GREENWICH STREET
                                                         NEW YORK, NY 10013

                                  COPIES TO:             DOUGLAS LOWE, ESQ.
                            PIERRE DE SAINT PHALLE,   DEAN WITTER REYNOLDS INC.
   LEE B. SPENCER, JR.               ESQ.                  TWO WORLD TRADE
   ONE NEW YORK PLAZA        450 LEXINGTON AVENUE        CENTER--59TH FLOOR
   NEW YORK, NY 10292         NEW YORK, NY 10017         NEW YORK, NY 10048
</TABLE>

The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year in March, 2000.

Check box if it is proposed that this filing will become effective on May 26,
2000 pursuant to paragraph (b) of Rule 485.  /X/

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- --------------------------------------------------------------------------------
<PAGE>
                           DEFINED ASSET FUNDS--REGISTERED TRADEMARK--
                           ----------------------------------------------------

                           MUNICIPAL INVESTMENT TRUST FUND
                           PUT SERIES--3
                           (A UNIT INVESTMENT TRUST)
                           -  LONG TERM MUNICIPAL BOND
                           -  DESIGNED FOR FEDERALLY TAX-FREE INCOME
                           -  MONTHLY DISTRIBUTIONS

SPONSORS:
MERRILL LYNCH,
PIERCE, FENNER & SMITH     -----------------------------------------------------
INCORPORATED               The Securities and Exchange Commission has not
SALOMON SMITH BARNEY INC.  approved or disapproved these Securities or passed
PRUDENTIAL SECURITIES      upon the adequacy of this prospectus. Any
INCORPORATED               representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC.  Prospectus dated May 26, 2000.

<PAGE>
- --------------------------------------------------------------------------------

Defined Asset Funds-SM-
For more than 28 years, Defined Asset Funds-Registered Trademark- has been a
leader in unit investment trust research and product innovation. Our family of
Funds helps investors work toward their financial goals with a full range of
quality investments, including municipal, corporate and government bond
portfolios, as well as domestic and international equity portfolios.

Defined Asset Funds offer a number of advantages:
  - Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
    funds are not managed and portfolio changes are limited.
  - Preselected Portfolios: We choose the stocks and bonds in advance, so you
    know what you're investing in.
  - Professional research: Our dedicated research team seeks out stocks or bonds
    appropriate for a particular fund's objectives.
  - Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.

THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS OF THE EVALUATION DATE, JANUARY
31, 2000.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ---
Defined Portfolio--
  Risk/Return Summary................    3
What You Can Expect From Your
  Investment.........................    6
  Monthly Income.....................    6
  Return Figures.....................    6
  Records and Reports................    6
The Risks You Face...................    7
  Interest Rate Risk.................    7
  Call Risk..........................    7
  Reduced Diversification Risk.......    7
  Collateral Related Risk............    7
  Liquidity Risk.....................    7
  Concentration Risk.................    7
  Litigation and Legislation Risks...    7
Selling or Exchanging Units..........    8
  Sponsors' Secondary Market.........    8
  Selling Units to the Trustee.......    8
  Exchange Option....................    9
How The Fund Works...................    9
  Pricing............................    9
  Evaluations........................    9
  Income.............................    9
  Expenses...........................    9
  Portfolio Changes..................   10
  Fund Termination...................   10
  Certificates.......................   11
  Trust Indenture....................   11
  Legal Opinion......................   12
  Auditors...........................   12
  Sponsors...........................   12
  Trustee............................   12
  Underwriters' and Sponsors'
    Profits..........................   12
  Public Distribution................   13
  Code of Ethics.....................   13
  Year 2000 Issues...................   13
Taxes................................   13
Supplemental Information.............   15
Financial Statements.................  D-1
</TABLE>

                                       2
<PAGE>
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RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 1.  WHAT ARE THE FUND'S OBJECTIVES?
  -  The Fund seeks interest income that is
     exempt from regular federal income taxes
     by investing in one long term municipal
     revenue bond with an estimated average
     life of about 21 years.
  -  The Fund seeks to reduce fluctuations in
     the value of the bond (and minimize the
     risk of losing money) through the
     repurchase commitment described below.

 2.  WHAT ARE MUNICIPAL REVENUE BONDS?
     Municipal revenue bonds are bonds issued
     by states, municipalities and public
     authorities to finance the cost of
     buying, building or improving various
     projects intended to generate revenue,
     such as airport, healthcare, housing and
     municipal utilities. Generally, payments
     on these bonds depend solely on the
     revenues generated by the project,
     excise taxes or state appropriations,
     and are not backed by the government's
     taxing power.

 3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
  -  The Fund contains only 1 bond.
  -  The Fund plans to hold to maturity 1
     long term tax-exempt municipal bond with
     an aggregate face amount of $4,893,546.
     The Fund is a unit investment trust
     which means that, unlike a mutual fund,
     the Portfolio is not managed.
  -  The bond was initially acquired from The
     Poughkeepsie Savings Bank, F.S.B. (the
     Seller), which had held it in its own
     portfolio.

  -  The Seller has agreed to repurchase any
     of the bonds sold by it to the Fund if:
     -- the Fund needs to sell bonds to meet
        redemptions of units;
     -- the issuer of a bond fails to make
        payments when due;
     -- the interest on a bond becomes
     taxable; and
     -- if insolvency proceedings are
     commenced by or against the Seller, or
        it fails to meet its collateral
        requirements.
  -  100% of the Portfolio is backed by the
     Seller's repurchase commitments.
  -  100% of the bonds are collateralized
     municipal revenue bonds.
  -  The Fund is concentrated in refunded
     bonds.
  -  The collateral securing the Sellers'
     repurchase commitments may include:
     -- Ginnie Maes, Fannie Maes and Freddie
        Macs;
     -- mortgages;
     -- municipal obligations;
     -- corporate obligations;
     -- U.S. government securities; and
     -- cash.
  -  You should rely on the collateral for
     the performance of the repurchase
     commitments rather than on the financial
     position of the Seller.

 4.  WHAT ARE THE SIGNIFICANT RISKS?
     YOU CAN LOSE MONEY BY INVESTING IN THE
     FUND. THIS CAN HAPPEN FOR VARIOUS
     REASONS, INCLUDING:
  -  Rising interest rates, the issuer's
     worsening financial condition or the
     Seller's failure to meet its repurchase
     commitments can reduce the price of your
     units.
  -  Assuming no changes in interest rates,
     when you sell your units, they will
     generally be worth less than your cost
     because your cost included a sales fee.
  -  The Fund could receive early returns of
     principal if underlying mortgages are
     prepaid, if it becomes necessary to
     liquidate the collateral or if the bond
     is called or sold before it matures. If
     this happens your income will decline
     and you may not be able to reinvest the
     money you receive at as high a yield or
     as long a maturity.
  -  The bond is currently callable.
</TABLE>

                                       3
<PAGE>

<TABLE>
<C>  <S>
 5.  IS THIS FUND APPROPRIATE FOR YOU?

     Yes, if you want federally tax-free
     income. You will benefit from a
     professionally selected and supervised
     portfolio whose risk is reduced by
     investing in a bond backed by
     collateralized repurchase commitments.
     The Fund is NOT appropriate for you if
     you want a speculative investment that
     changes to take advantage of market
     movements, if you do not want a
     tax-advantaged investment or if you
     cannot tolerate any risk.
</TABLE>

<TABLE>
<C>  <S>
     DEFINING YOUR INCOME
</TABLE>

<TABLE>
<C>  <S>                                            <C>
     WHAT YOU MAY EXPECT (Payable on the 25th day
     of the month to holders of record on the 10th
     day of the month):
     Regular Monthly Income per unit                 $ 1.17
     Annual Income per unit:                         $14.09
     THESE FIGURES ARE ESTIMATES DETERMINED ON THE
     EVALUATION DAY; ACTUAL PAYMENTS MAY VARY.
</TABLE>

<TABLE>
<C>  <S>
 6.  WHAT ARE THE FUND'S FEES AND EXPENSES?

     This table shows the costs and expenses you may pay,
     directly or indirectly, when you invest in the Fund.
</TABLE>

<TABLE>
<C>  <S>                                    <C>
     INVESTOR FEES

                                               none
     Maximum Sales Fee (Load) on new
     purchases
</TABLE>

<TABLE>
<C>  <S>
     ESTIMATED ANNUAL FUND OPERATING EXPENSES
</TABLE>

<TABLE>
<CAPTION>
                                                    AMOUNT
                                                   PER UNIT
                                                   --------
<C>  <S>                                          <C>
                                                    $0.03
     Trustee's Fee
                                                    $0.02
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees
     (including updating
     expenses)
                                                    $0.15
     Evaluator's Fee
                                                    $0.31
     Other Operating Expenses
                                                    -----
                                                    $0.51
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
 7.  IS THE FUND MANAGED?

     Unlike a mutual fund, the Fund is not managed
     and bonds are not sold because of market
     changes. Rather, experienced Defined Asset Funds
     financial analysts regularly review the bonds in
     the Fund. The Fund may sell a bond if certain
     adverse credit or other conditions exist.
 8.  HOW DO I BUY UNITS?

     The minimum investment is one unit.

     You can buy units from any of the Sponsors and
     other broker-dealers. The Sponsors are listed
     later in this prospectus. Some banks may offer
     units for sale through special arrangements with
     the Sponsors, although certain legal
     restrictions may apply.

     UNIT PRICE PER UNIT                 $186.03
     (as of January 31, 2000)

     Unit price is based on the net asset value of
     the Fund plus the sales fee. An amount equal to
     any principal cash, as well as net accrued but
     undistributed interest on the unit, is added to
     the unit price. An independent evaluator prices
     the bonds at 3:30 p.m. Eastern time every
     business day. Unit price changes every day with
     changes in the prices of the bonds in the Fund.
</TABLE>

                                       4
<PAGE>

<TABLE>
<C>  <S>
 9.  HOW DO I SELL UNITS?

     You may sell your units at any time to
     any Sponsor or the Trustee for the net
     asset value determined at the close of
     business on the date of sale. You will
     not pay any other fee when you sell your
     units.

10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?

     The Fund pays income monthly.

     In the opinion of bond counsel when each
     bond was issued, interest on the bonds
     in this Fund is generally 100% exempt
     from regular federal income tax.

     You will also receive principal payments
     if the bond is sold or called or
     matures, when the cash available is more
     than $5.00 per unit. You will be subject
     to tax on any gain realized by the Fund
     on the disposition of the bond.

11.  WHAT OTHER SERVICES ARE AVAILABLE?

     REINVESTMENT
     You will receive your income in cash
     unless you choose to compound your
     income by reinvesting at no sales fee in
     the Municipal Fund Investment
     Accumulation Program, Inc. This Program
     is an open-end mutual fund with a
     comparable investment objective. Income
     from this Program will generally be
     subject to state and local income taxes.
     FOR MORE COMPLETE INFORMATION ABOUT THE
     PROGRAM, INCLUDING CHARGES AND FEES, ASK
     THE TRUSTEE FOR THE PROGRAM'S
     PROSPECTUS. READ IT CAREFULLY BEFORE YOU
     INVEST. THE TRUSTEE MUST RECEIVE YOUR
     WRITTEN ELECTION TO REINVEST AT LEAST 10
     DAYS BEFORE THE RECORD DAY OF AN INCOME
     PAYMENT.

     EXCHANGE PRIVILEGES
     You may exchange units of this Fund for
     units of certain other Defined Asset
     Funds. You may also exchange into this
     Fund from certain other funds. We charge
     a reduced sales fee on most exchanges.
</TABLE>

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    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS

<TABLE>
                                      EFFECTIVE
TAXABLE INCOME 2000*                  % TAX                                  TAX-FREE YIELD OF
  SINGLE RETURN      JOINT RETURN     BRACKET      3%        3.5%        4%        4.5%        5%        5.5%        6%
                                                                    IS EQUIVALENT TO A TAXABLE YIELD OF
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$      0- 26,250   $      0- 43,850    15.00       3.53       4.12       4.71       5.29       5.88       6.47       7.06
- ---------------------------------------------------------------------------------------------------------------------------
$ 26,251- 63,550   $ 43,851-105,950    28.00       4.17       4.86       5.56       6.25       6.94       7.64       8.33
- ---------------------------------------------------------------------------------------------------------------------------
$ 63,551-132,600   $105,951-161,450    31.00       4.35       5.07       5.80       6.52       7.25       7.97       8.70
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
$132,601-288,350   $161,451-288,350    36.00       4.69       5.47       6.25       7.03       7.81       8.59       9.38
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
  OVER $288,350    OVER $288,350       39.60       4.97       5.79       6.62       7.45       8.28       9.11       9.93
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>

<S>                <C>
TAXABLE INCOME 20
  SINGLE RETURN     6.5%
                      IS
                   EQUIVALENT
                     TO A
                   TAXABLE
                   YIELD OF
- -----------------
$      0- 26,250     7.65
- -----------------
$ 26,251- 63,550     9.03
- -----------------
$ 63,551-132,600     9.42
                   --------
- -----------------
$132,601-288,350    10.16
                   --------
- -----------------
  OVER $288,350     10.76
                   --------
- -----------------
</TABLE>

To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 2000 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.

*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.

                                       5
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT

MONTHLY INCOME

The Fund will pay you regular monthly income. Your monthly income may vary
because of:
  - elimination of the bond from the Fund's portfolio because of call,
    redemption or sale;
  - a change in the Fund's expenses; or
  - the failure by the bond's issuer to pay interest.

Changes in interest rates generally will not affect your income because the
portfolio is fixed.

Along with your income, you will receive your share of any available bond
principal.

RETURN FIGURES

We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.

ESTIMATED CURRENT RETURN equals the estimated annual cash to be received from
the bond in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):

<TABLE>
<S>              <C>  <C>
Estimated Annual         Estimated
Interest Income   -   Annual Expenses
- -------------------------------------
             Unit Price
</TABLE>

ESTIMATED LONG TERM RETURN is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bond in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting the bond's yield by its market value and the time
remaining to the call or maturity date.

Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.

These return quotations are designed to be comparative rather than predictive.

RECORDS AND REPORTS

You will receive:
- - a monthly statement of income payments and any principal payments;
- - a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
- - an annual report on Fund activity; and
- - annual tax information. THIS WILL ALSO BE SENT TO THE IRS. YOU MUST REPORT THE
  AMOUNT OF TAX-EXEMPT INTEREST RECEIVED DURING THE YEAR.

You may request:
- - copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
- - audited financial statements of the Fund.

You may inspect records of Fund transactions at the Trustee's office during
regular business hours.

                                       6
<PAGE>
THE RISKS YOU FACE

INTEREST RATE RISK

Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.

CALL RISK

All the bonds in this Fund are currently callable by the issuer.

If the bonds are called, your income will decline and you may not be able to
reinvest the money you receive at as high a yield or as long a maturity. An
early call at par of a premium bond will reduce your return.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell the bond. This
could increase your share of Fund expenses.

LIQUIDITY RISK

You can always sell back your units, but we cannot assure you that a liquid
trading market will always exist for the bonds in the portfolio, especially
since current law may restrict the Fund from selling bonds to any Sponsor. The
bonds will generally trade in the over-the-counter market. The value of the
bonds, and of your investment, may be reduced if trading in bonds is limited or
absent.

COLLATERAL RELATED RISK

The Sponsors believe that the collateral is reasonably adequate to support the
repurchase commitments without regard to the ability of the Seller to meet these
commitments.

You could have all or part of the principal amount of your investment returned
early if insolvency proceedings are commenced by or against a Seller. In that
case, the collateral agent will automatically foreclose on the collateral and,
if necessary, liquidate it and use the proceeds to purchase bonds from the Fund.
You would then receive your share of the proceeds.

The Sponsors have agreed that their sole recourse in the event the Seller fails
to repurchase the bonds as agreed, including as a result of the Seller's
insolvency, will be to exercise available remedies with respect to the
collateral on deposit with the Fund. If the collateral is not enough to cover
the costs resulting from the Seller's default, the Sponsors will be unable to
pursue any deficiency judgment against the Seller.

LITIGATION AND LEGISLATION RISKS

We do not know of any pending litigation that might have a material adverse
effect upon the Fund.

Future tax legislation could affect the value of the portfolio by:
  - limiting real property taxes,
  - reducing tax rates,
  - imposing a flat or other form of tax, or
  - exempting investment income from tax.

                                       7
<PAGE>
SELLING OR EXCHANGING UNITS

You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
  - ADDING the value of the bonds, net accrued interest, cash and any other Fund
    assets;
  - SUBTRACTING accrued but unpaid Fund expenses, unreimbursed Trustee advances,
    cash held to buy back units or for distribution to investors and any other
    Fund liabilities; and
  - DIVIDING the result by the number of outstanding units.

Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.

SPONSORS' SECONDARY MARKET

While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge. We may resell the units to other buyers or to
the Trustee. You should consult your financial professional for current market
prices to determine if other broker-dealers or banks are offering higher prices.

We have maintained the secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.

SELLING UNITS TO THE TRUSTEE

Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.

Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.

As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.

If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.

There could be a delay in paying you for your units:
  - if the New York Stock Exchange is closed (other than customary weekend and
    holiday closings);
  - if the SEC determines that trading on the New York Stock Exchange is
    restricted or that an emergency exists

                                       8
<PAGE>
    making sale or evaluation of the bonds not reasonably practicable; and
  - for any other period permitted by SEC order.

EXCHANGE OPTION

You may exchange units of certain Defined Asset Funds for units of this Fund
with no sales fee. You may exchange units of this Fund for units of certain
other Defined Asset Funds at a reduced sales fee if your investment goals
change. To exchange units, you should talk to your financial professional about
what funds are exchangeable, suitable and currently available.

Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.

We may amend or terminate this exchange option at any time without notice.

HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the bonds, less expenses, from
the initial most recent Record Day up to, but not including, the settlement
date, which is usually three business days after the purchase date of the unit.

A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular monthly income. When you sell your units you will
receive your share of this cash.

EVALUATIONS

An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.

INCOME

The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.

PLACEMENT FEE

The Sponsors receive a quarterly placement fee from the Seller equal to 0.3125%
of the aggregate principal amount of the bond sold by the Seller and held by the
Fund.

EXPENSES

The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
  - to reimburse the Trustee for the Fund's operating expenses;

                                       9
<PAGE>
  - for extraordinary services and costs of indemnifying the Trustee and the
    Sponsors;
  - costs of actions taken to protect the Fund and other legal fees and
    expenses;
  - expenses for keeping the Fund's registration statement current; and
  - Fund termination expenses and any governmental charges.

The Sponsors are currently reimbursed up to 55 CENTS per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Fund's registration statement yearly are also now
chargeable to the Fund. While this fee may exceed the amount of these costs and
expenses attributable to this Fund, the total of these fees for all Series of
Defined Asset Funds will not exceed the aggregate amount attributable to all of
these Series for any calendar year. The Fund also pays the Evaluator's fees.

The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.

The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.

PORTFOLIO CHANGES

The Sponsors and Trustee are not liable for any default or defect in the bond.

Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.

If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which may affect the
composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.

We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
  - diversity of the portfolio;
  - size of the Fund relative to its original size;
  - ratio of Fund expenses to income;
  - current and long-term returns;
  - degree to which units may be selling at a premium over par; and
  - cost of maintaining a current prospectus.

FUND TERMINATION

The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.

                                       10
<PAGE>
When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.

You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.

CERTIFICATES

Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.

TRUST INDENTURE

The Fund is a "unit investment trust" governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.

The Sponsors and the Trustee may amend the Indenture without your consent:
  - to cure ambiguities;
  - to correct or supplement any defective or inconsistent provision;
  - to make any amendment required by any governmental agency; or
  - to make other changes determined not to be materially adverse to your best
    interest (as determined by the Sponsors).

Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.

The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
  - it fails to perform its duties and the Sponsors determine that its
    replacement is in your best interest; or
  - it becomes incapable of acting or bankrupt or its affairs are taken over by
    public authorities.

Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.

Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
  - remove it and appoint a replacement Sponsor;

                                       11
<PAGE>
  - liquidate the Fund; or
  - continue to act as Trustee without a Sponsor.

Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.

The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.

LEGAL OPINION

Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
counsel for the Sponsors, has given an opinion that the units are validly
issued. Special counsel located in the relevant states have given state and
local tax opinions.

AUDITORS

Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.

SPONSORS

The Sponsors are:

MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
PRUDENTIAL SECURITIES INCORPORATED (an
indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292

Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.

TRUSTEE

The Bank of New York, 101 Barclay Street, 17 W, New York, New York 10268, is the
Trustee. It is supervised by the Federal Deposit Insurance Corporation, the
Board of Governors of the Federal Reserve System and New York State banking
authorities.

UNDERWRITERS' AND SPONSORS' PROFITS

Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial date of deposit of the bonds. Any cash
made available by you to the Sponsors before the settlement date for those units
may be used in the Sponsors' businesses to the extent permitted by federal law
and may benefit the Sponsors.

A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.

                                       12
<PAGE>
In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.

PUBLIC DISTRIBUTION

The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.

CODE OF ETHICS

The Fund and the Agent for the Sponsors have each adopted a code of ethics
requiring reporting of personal securities transactions by its employees with
access to information on Fund transactions. Subject to certain conditions, the
codes permit employees to invest in Fund securities for their own accounts. The
codes are designed to prevent fraud, deception and misconduct against the Fund
and to provide reasonable standards of conduct. These codes are on file with the
Commission and you may obtain a copy by contacting the Commission at the address
listed on the back cover of this prospectus.

YEAR 2000 ISSUES

Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the "Year
2000 Problem"). To date we are not aware of any major operational difficulties
resulting from the computer system changes necessary to prepare for the Year
2000. However, there can be no assurance that the Year 2000 Problem will not
adversely affect the issuers of the bonds contained in the Portfolio. We cannot
predict whether any impact will be material to the Fund as a whole.

TAXES

The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances or subject to
special rules. You should consult your own tax adviser about your particular
circumstances.

At the date of issue of the bond, counsel for the issuer delivered an opinion to
the effect that interest on the bond is exempt from regular federal income tax.
However, interest may be subject to state and local taxes and federal
alternative minimum tax. Neither we nor our counsel have reviewed the issuance
of the bonds, related proceedings or the basis for the opinions of counsel for
the issuers. We cannot assure you that the issuer (or other users) have complied
or will comply with any requirements necessary for a bond to be tax-exempt. If
the bonds were determined not to be tax-exempt, you could be required to pay
income tax for current and prior years, and if the Fund were to sell the bond,
it might have to sell it at a substantial discount.

                                       13
<PAGE>
In the opinion of our counsel, under existing law:

GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT

The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.

Our counsel is of the opinion that the Fund (and therefore the investors, as
discussed below) will be treated as owning the bonds, notwithstanding the
Seller's repurchase commitments. However, because there are no regulations,
published rulings or judicial decisions that characterize for federal income tax
purposes repurchase commitments like the Seller's with respect to the bonds, it
is not certain that the IRS will agree with the conclusions of our counsel.
Therefore, it is possible that the IRS may take actions that might result in the
Fund (and therefore the investors) not being treated as owning the bonds for
federal income tax purposes.

GAIN OR LOSS UPON DISPOSITION

When all or part of your share of the bond is disposed of (for example, when the
Fund sells, exchanges or redeems the bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. While not free from
doubt, the opinion of our counsel is that any capital gain or loss derived from
the Fund will be short-term capital gain or loss regardless of the time that you
have held your Units.

YOUR BASIS IN THE BONDS

You may be required to allocate a portion of your cost for your Units to the
Seller's repurchase commitment with respect to the bonds. When all or part of
your pro rata portion of a bond is disposed of (and the commitment with respect
to that bond simultaneously is disposed of, lapses or is exercised), both your
basis in your pro rata portion of the bond and your basis in your pro rata
portion of the commitment will be taken into account in determining your overall
net income or loss from the disposition. In some cases, this overall net income
or loss may consist of ordinary income attributable to market discount on the
pro rata portion of the bond and of capital loss attributable to the commitment.
The deductibility of capital losses is subject to limitations. You should
consult your tax adviser in this regard.

If your basis for your pro rata portion of a bond (after giving effect to any
required allocation to the commitment) exceeds the redemption price at maturity
of that bond, you may be considered to have purchased your pro rata portion of
the bond at a "bond premium," which must be amortized.

EXPENSES

If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.

                                       14
<PAGE>
STATE AND LOCAL TAXES

Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.

SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolios, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

                                       15
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
  of Defined Asset Funds - Municipal Investment Trust Fund,
  Put Series - 3:

We have audited the accompanying statement of condition of Defined Asset Funds -
Municipal Investment Trust Fund, Put Series - 3, including the portfolio, as of
January 31, 2000 and the related statements of operations and of changes in net
assets for the years ended January 31, 2000, 1999 and 1998. These financial
statements are the responsibility of the Trustee. Our responsibility is to
express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Securities owned at
January 31, 2000, as shown in such portfolio, were confirmed to us by The Bank
of New York, the Trustee. An audit also includes assessing the accounting
principles used and significant estimates made by the Trustee, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Defined Asset Funds - Municipal
Investment Trust Fund, Put Series - 3 at January 31, 2000 and the results of its
operations and changes in its net assets for the above-stated years in
conformity with generally accepted accounting principles.

DELOITTE & TOUCHE LLP

New York, N.Y.
April 5, 2000


                                      D - 1
<PAGE>
<TABLE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

STATEMENT OF CONDITION
AS OF JANUARY 31, 2000

<S>                                                <C>           <C>
TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $4,404,191)(Note 1)......................                  $4,404,191
  Securities called for redemption
    (cost $6,971)(Note 5)..........................                       7,746
  Accrued interest receivable......................                      29,101
  Cash.............................................                      48,277
                                                                   -------------

              Total trust property.................                   4,489,315

LESS LIABILITY - Accrued expenses..................                         648
                                                                   -------------

NET ASSETS, REPRESENTED BY:
  23,914 units of fractional undivided
    interest outstanding (Note 3)..................   $4,419,762
  Undistributed net investment income..............       68,905
                                                    -------------
                                                                      $4,488,667
                                                                   =============
UNIT VALUE ($4,488,667/23,914 units)...............                     $187.70
                                                                   =============

</TABLE>
                       See Notes to Financial Statements.


                                      D - 2
<PAGE>
<TABLE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

STATEMENTS OF OPERATIONS

<CAPTION>
                                             .......Years Ended January 31,..........
                                                 2000         1999         1998
                                             -----------------------------------------
<S>                                        <C>          <C>          <C>
INVESTMENT INCOME:
  Interest income...........................    $352,177     $422,967     $460,424
  Trustee's fees and expenses...............     (12,152)     (12,491)     (12,361)
  Sponsors' fees............................        (293)        (404)        (313)
                                             -----------------------------------------
  Net investment income.....................     339,732      410,072      447,750
                                             -----------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Realized gain on securities sold
    or redeemed.............................       8,935        8,301        7,713
  Unrealized appreciation of investments....          55           51           48
                                             -----------------------------------------

  Net realized and unrealized gain on
    investments.............................       8,990        8,352        7,761
                                             -----------------------------------------

NET INCREASE IN NET ASSETS RESULTING
  FROM OPERATIONS...........................    $348,722     $418,424     $455,511
                                             =========================================

</TABLE>
                       See Notes to Financial Statements.


                                      D - 3
<PAGE>
<TABLE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

STATEMENTS OF CHANGES IN NET ASSETS

<CAPTION>
                                               .......Years Ended January 31,..........
                                                   2000         1999         1998
                                               -----------------------------------------
<S>                                          <C>          <C>          <C>
OPERATIONS:
  Net investment income.......................  $  339,732   $  410,072   $  447,750
  Realized gain on securities sold
    or redeemed...............................       8,935        8,301        7,713
  Unrealized appreciation of investments......          55           51           48
                                               -----------------------------------------
  Net increase in net assets resulting
    from operations...........................     348,722      418,424      455,511
                                               -----------------------------------------

DISTRIBUTIONS TO HOLDERS (Note 2):
  Income......................................    (346,516)    (423,278)    (453,409)
  Principal...................................     (88,721)  (1,113,914)    (164,050)
                                               -----------------------------------------
  Total distributions.........................    (435,237)  (1,537,192)    (617,459)
                                               -----------------------------------------
NET DECREASE IN NET ASSETS....................     (86,515)  (1,118,768)    (161,948)

NET ASSETS AT BEGINNING OF YEAR...............   4,575,182    5,693,950    5,855,898
                                               -----------------------------------------
NET ASSETS AT END OF YEAR.....................  $4,488,667   $4,575,182   $5,693,950
                                               =========================================
PER UNIT:
  Income distributions during year............      $14.49       $17.70       $18.96
                                               =========================================
  Principal distributions during year.........       $3.71       $46.58        $6.86
                                               =========================================
  Net asset value at end of year..............     $187.70      $191.32      $238.10
                                               =========================================
TRUST UNITS OUTSTANDING AT END OF YEAR........      23,914       23,914       23,914
                                               =========================================

</TABLE>
                       See Notes to Financial Statements.


                                      D - 4
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

NOTES TO FINANCIAL STATEMENTS

  1.  SIGNIFICANT ACCOUNTING POLICIES

      The Fund is registered under the Investment Company Act of 1940 as a Unit
      Investment Trust. The following is a summary of significant accounting
      policies consistently followed by the Fund in the preparation of its
      financial statements. The policies are in conformity with generally
      accepted accounting principles.

      (a) Securities are stated at value as determined by the Evaluator
          based on bid side evaluations for the securities.

      (b) The Fund is not subject to income taxes. Accordingly, no
          provision for such taxes is required.

      (c) Interest income is recorded as earned.

  2.  DISTRIBUTIONS

      A distribution of net investment income is made to Holders each month.
      Receipts other than interest, after deductions for redemptions and
      applicable expenses, are also distributed periodically.

  3.  NET CAPITAL
<TABLE>
     <S>                                                  <C>
      Cost of 23,914 units at Date of Deposit.............   $22,899,771
      Less sales charge...................................       228,281
                                                           --------------
      Net amount applicable to Holders....................    22,671,490
      Realized gain on securities sold or redeemed........       567,097
      Principal distributions.............................   (18,819,600)
      Unrealized appreciation of investments..............           775
                                                           --------------

      Net capital applicable to Holders...................   $ 4,419,762
                                                           ==============
</TABLE>

  4.  INCOME TAXES

      As of January 31, 2000, unrealized appreciation of investments (including
      securities called for redemption), based on cost for Federal income tax
      purposes, aggregated $775, all of which related to appreciated securities.
      The cost of investment securities for Federal income tax purposes was
      $4,411,162 at January 31, 2000.


                                      D - 5
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

NOTES TO FINANCIAL STATEMENTS

  5.  SECURITIES CALLED FOR REDEMPTION

      $7,746 face amount of The Saint Claire County Housing Finance
      Corporation Illinois, Obligation (Greystone Park Apartments)
      Ser. 1978 were called for redemption on February 1, 2000. Such
      securities are valued at the amount of the proceeds subsequently
      received.


                                      D - 6
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

PORTFOLIO
AS OF JANUARY 31, 2000

<TABLE>
<CAPTION>
                                      Rating                                                     Optional
  Portfolio No. and Title of           of            Face                        Disposition   Redemption
          Securities                Issues(1)       Amount   Coupon   Maturities Date(4)       Provisions(3)       Cost
          ----------                ---------       ------   ------  ----------- ------------- -------------   ---------
<S>                                  <C>        <C>           <C>       <C>         <C>        <C>            <C>
1 The Saint Claire County Housing     NR        $4,893,546    7.125%    2021        7/1/20     Currently      $4,404,191
  Finance Corporation, Illinois,
  Obligation, (Greystone Park
  Apartments) Ser. 1978

                                              --------------                                                --------------
TOTAL                                             $4,893,546                                                    $4,404,191
                                                ==============                                                ============

<CAPTION>

  Portfolio No. and Title of
          Securities                 Value(2)
          ----------               ----------
<S>
1 The Saint Claire County Housing  $4,404,191
  Finance Corporation, Illinois,
  Obligation, (Greystone Park
  Apartments) Ser. 1978

                                   ----------
TOTAL                                $4,404,191
                                    ===========
</TABLE>

                             See Notes to Portfolio.


                                      D - 7

<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 3

NOTES TO PORTFOLIO
AS OF JANUARY 31, 2000

   (1)See Notes to Financial Statements.

   (2)Optional redemption provisions, which may be exercised in whole or in
      part, are initially at prices of par plus a premium, then subsequently at
      prices declining to par. Certain securities may provide for redemption at
      par prior or in addition to any optional or mandatory redemption dates or
      maturity, for example, through the operation of a maintenance and
      replacement fund, if proceeds are not able to be used as contemplated, the
      project is condemned or sold or the project is destroyed and insurance
      proceeds are used to redeem the securities. Many of the securities are
      also subject to mandatory sinking fund redemption commencing on dates
      which may be prior to the date on which securities may be optionally
      redeemed. Sinking fund redemptions are at par and redeem only part of the
      issue. Some of the securities have mandatory sinking funds which contain
      optional provisions permitting the issuer to increase the principal amount
      of securities called on a mandatory redemption date. The sinking fund
      redemptions with optional provisions may, and optional refunding
      redemptions generally will, occur at times when the redeemed securities
      have an offering side evaluation which represents a premium over par. To
      the extent that the securities were acquired at a price higher than the
      redemption price, this will represent a loss of capital when compared with
      the Public Offering Price of the Units when acquired. Distributions will
      generally be reduced by the amount of the income which would otherwise
      have been paid with respect to redeemed securities and there will be
      distributed to Holders any principal amount and premium received on such
      redemption after satisfying any redemption requests for Units received by
      the Fund. The estimated current return may be affected by redemptions.

   (3)All Securities in the fund have been purchased from savings banks or
      savings and loan associations (the "seller"), each of which has committed
      to repurchase any security sold be it to the Fund upon the occurrence of
      certain events. Any repurchase is at a price not less than the original
      purchase price to the Fund of the security plus interest accrued to the
      date of repurchase. These repurchase commitments are backed by collateral.

   (4)The Trustee will cause the Seller of each security to purchase such
      security at its original purchase price to the Fund on the disposition
      date specified unless on or before such date it can be sold, in the
      opinion of the Sponsors, for a net amount in excess of the original
      purchase price to the Fund.


                                      D - 8

<PAGE>

DEFINED ASSET FUNDS--REGISTERED TRADEMARK--

<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free             PUT SERIES--3
Information Supplement                   (A Unit Investment Trust)
that gives more details about            ---------------------------------------
the Fund, by calling:                    This Prospectus does not contain
The Bank of New York                     complete information about the
1-800-221-7771                           investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         - Securities Act of 1933 (file no.
                                         2-88326) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         UNITS OF ANY FUTURE SERIES MAY NOT BE
                                         SOLD NOR MAY OFFERS TO BUY BE ACCEPTED
                                         UNTIL THAT SERIES HAS BECOME EFFECTIVE
                                         WITH THE SECURITIES AND EXCHANGE
                                         COMMISSION. NO UNITS CAN BE SOLD IN ANY
                                         STATE WHERE A SALE WOULD BE ILLEGAL.
                                                                     13734--5/00
</TABLE>
<PAGE>
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                                   PUT SERIES
                       CONTENTS OF REGISTRATION STATEMENT

    This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:

    The facing sheet of Form S-6.

    The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Insured
Series, 1933 Act File No. 33-54565).

    The Prospectus.

    The Signatures.

The following exhibits:

    1.1.1-- Form of Standard Terms and Conditions of Trust Effective as of
           October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
           Registration Statement of Municipal Investment Trust Fund,
           Multi-state Series--48, 1933 Act File No. 33-50247).

    1.11.1-- Merrill Lynch Code of Ethics (incorporated by reference to Exhibit
            1.11.1 to the Post Effective Amendment No. 8 to the Registration
            Statement of Municipal Investment Trust Fund, Insured Series 186,
            1933 Act File No. 33-49159).

    1.11.2-- Municipal Investment Trust Fund Code of Ethics (incorporated by
            reference to Exhibit 1.11.2 to the Post Effective Amendment No. 8 to
            the Registration Statement of Municipal Investment Trust Fund,
            Insured Series 186, 1933 Act File No. 33-49159).

    4.1  --Consent of the Evaluator.

    5.1  --Consent of independent accountants.

    9.1  -- Information Supplement (incorporated by reference to Exhibit 9.1 to
           Amendment No. 1 to the Registration Statement of Municipal Investment
           Trust Fund, Multistate Series--409, 1933 Act File No. 333-81777).

                                      R-1
<PAGE>
                             DEFINED ASSET FUNDS--
                        MUNICIPAL INVESTMENT TRUST FUND
                                 PUT SERIES--3

                                   SIGNATURES

    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
DEFINED ASSET FUNDS--MUNICIPAL INVESTMENT TRUST FUND, PUT SERIES--3, CERTIFIES
THAT IT MEETS ALL OF THE REQUIREMENTS FOR EFFECTIVENESS OF THIS REGISTRATION
STATEMENT PURSUANT TO RULE 485(B) UNDER THE SECURITIES ACT OF 1933 AND HAS DULY
CAUSED THIS REGISTRATION STATEMENT OR AMENDMENT TO THE REGISTRATION STATEMENT TO
BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY AUTHORIZED IN THE CITY
OF NEW YORK AND STATE OF NEW YORK ON THE 17TH DAY OF MAY, 2000.

               SIGNATURES APPEAR ON PAGES R-3, R-4, R-5 AND R-6.

    A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

    A majority of the members of the Board of Directors of Salomon Smith Barney
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

    A majority of the members of the Board of Directors of Prudential Securities
Incorporated has signed this Registration Statement or Amendment to the
Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.

    A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              NumberNumber: 333-70593
</TABLE>

     GEORGE A. SCHIEREN
     JOHN L. STEFFENS
     By JAY M. FIFE
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)

                                      R-3
<PAGE>
                           SALOMON SMITH BARNEY INC.
                                   DEPOSITOR

<TABLE>
<S>                                                           <C>
By the following persons, who constitute a majority of        Powers of Attorney
  the Board of Directors of Salomon Smith Barney Inc.:          have been filed
                                                                under the 1933 Act
                                                                File Numbers:
                                                                333-63417 and
                                                                333-63033
</TABLE>

     MICHAEL A. CARPENTER
     DERYCK C. MAUGHAN

     By GINA LEMON
       (As authorized signatory for
       Salomon Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)

                                      R-4
<PAGE>
                       PRUDENTIAL SECURITIES INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                                                     <C>
By the following persons, who constitute a majority of                  Powers of Attorney
  the Board of Directors of Prudential Securities                         have been filed
  Incorporated:                                                           under Form SE and
                                                                          the following 1933
                                                                          Act File Numbers:
                                                                          33-41631 and
                                                                          333-15919
</TABLE>

     ROBERT C. GOLDEN
     ALAN D. HOGAN
     A. LAURENCE NORTON, JR.
     LELAND B. PATON
     VINCENT T. PICA II
     MARTIN PFINSGRAFF
     HARDWICK SIMMONS
     LEE B. SPENCER, JR.
     BRIAN M. STORMS

     By RICHARD R. HOFFMANN
       (As authorized signatory for Prudential Securities
       Incorporated and Attorney-in-fact for the persons
       listed above)

                                      R-5
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085,
  Reynolds Inc.:                            333-13039, 333-47553 and 333-89045
</TABLE>

     BRUCE F. ALONSO
     RICHARD M. DeMARTINI
     RAYMOND J. DROP
     JAMES F. HIGGINS
     JOHN J. MACK
     MITCHELL M. MERIN
     STEPHEN R. MILLER
     PHILIP J. PURCELL
     JOHN H. SCHAEFER
     THOMAS C. SCHNEIDER
     ALAN A. SCHRODER
     ROBERT G. SCOTT
     By MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)

                                      R-6


                                                                     EXHIBIT 4.1

                               STANDARD & POOR'S
                    A DIVISION OF THE McGRAW-HILL COMPANIES
                                  J. J. KENNY
                                  65 BROADWAY
                           NEW YORK, N.Y. 10006-2551
                            TELEPHONE (212) 770-4422
                                FAX 212/797-8681

                                                      May 17, 2000

Frank A. Ciccotto, Jr
Vice President
Tax-Exempt Evaluations

<TABLE>
<S>                                       <C>
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051

The Bank of New York
101 Barclay Street
New York, New York 10286
</TABLE>

RE: DEFINED ASSET FUNDS--MUNICIPAL INVESTMENT TRUST FUND,
    PUT SERIES--3

Gentlemen:

  We have examined the post-effective Amendment to the Registration Statement
File No. 2-88326 for the above-captioned trust. We hereby acknowledge that Kenny
S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently acting
as the evaluator for the trust. We hereby consent to the use in the Amendment of
the reference to Kenny S&P Evaluation Services, a division of J. J. Kenny Co.,
Inc. as evaluator.

  In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in our
KENNYBASE database.

  You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.

                                                      Sincerely,
                                                      FRANK A. CICCOTTO
                                                      Vice President



                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Sponsors and Trustee of
Defined Asset Funds--Municipal Investment Trust Fund--Put Series--3

We consent to the use in this Post-Effective Amendment No. 13 to Registration
Statement No. 2-88326 of our opinion dated April 5, 2000 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading "Auditors" in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
May 17, 2000



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