GOVERNMENT SEC INC FUND GOVT AGENCY LADDERD SER DEF ASSET FD
485BPOS, 2000-04-12
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     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 12, 2000

                                                      REGISTRATION NO. 333-69539
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

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

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       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:

                       GOVERNMENT SECURITIES INCOME FUND
                     U.S. GOVERNMENT AGENCY LADDERED SERIES
                              DEFINED ASSET FUNDS
                           (A UNIT INVESTMENT TRUST)

B. NAMES OF DEPOSITORS:

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

C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:

<TABLE>
<S>                        <C>                        <C>
 MERRILL LYNCH, PIERCE,
     FENNER & SMITH
      INCORPORATED
 UNIT INVESTMENT TRUSTS
  POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051                              SALOMON SMITH BARNEY INC.
                                                       TWO WORLD TRADE CENTER
                                                             101ST FLOOR
                                                         NEW YORK, NY 10048
</TABLE>

<TABLE>
    <S>                          <C>                          <C>
    PAINEWEBBER INCORPORATED
       1285 AVENUE OF THE
            AMERICAS
       NEW YORK, NY 10019                                     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 ST.
                                                         NEW YORK, NY 10013

    ROBERT E. HOLLEY              COPIES TO:             DOUGLAS LOWE, ESQ.
    1200 HARBOR BLVD.       PIERRE DE SAINT PHALLE,   DEAN WITTER REYNOLDS INC.
   WEEHAWKEN, NJ 07087               ESQ.                  TWO WORLD TRADE
                             450 LEXINGTON AVENUE        CENTER--59TH FLOOR
                              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 will file the Rule 24f-2 Notice for the most
recent fiscal year in March, 2000.

Check box if it is proposed that this Registration Statement will become
effective on April 20, 2000 pursuant to paragraph (b) of Rule 485.  /X/

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

                           GOVERNMENT SECURITIES INCOME FUND
                           U.S. GOVERNMENT AGENCY
                           LADDERED SERIES
                           A UNIT INVESTMENT TRUST
                           -  PORTFOLIO OF AAA-RATED SHORT AND INTERMEDIATE TERM
                              BONDS
                           -  LADDERED MATURITIES
                           -  MONTHLY INCOME DISTRIBUTIONS
                           -  EXEMPT FROM STATE AND LOCAL TAXES
                           -  U.S. TAX EXEMPT FOR MANY FOREIGN HOLDERS

SPONSORS:
MERRILL LYNCH,             -----------------------------------------------------
PIERCE, FENNER & SMITH     The Securities and Exchange Commission has not
INCORPORATED               approved or disapproved these Securities or passed
SALOMON SMITH BARNEY INC.  upon the adequacy of this prospectus. Any
PAINEWEBBER INCORPORATED   representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC.  Prospectus dated April 20, 2000.

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

Defined Asset Funds--Registered Trademark--
Defined Asset Funds-Registered Trademark- is America's oldest and largest family
of unit investment trusts, with over $160 billion sponsored over the last 28
years. Defined Asset Funds 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:
  - A disciplined strategy of buying and holding with a long-term view is the
    cornerstone of Defined Asset Funds.
  - Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
    funds are not managed and portfolio changes are limited.
  - Defined 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 AS OF THE EVALUATION DATE,
DECEMBER 31, 1999.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ---
Risk/Return Summary..................    3
What You Can Expect From Your
  Investment.........................    5
  Monthly Income.....................    5
  Return Figures.....................    5
  Records and Reports................    5
The Risks You Face...................    6
  Interest Rate Risk.................    6
  Reduced Diversification Risk.......    6
  Litigation Risk....................    6
Selling Units........................    6
  Sponsors' Secondary Market.........    6
  Selling Units to the Trustee.......    6
How The Fund Works...................    7
  Pricing............................    7
  Evaluations........................    7
  Income.............................    7
  Expenses...........................    8
  Portfolio Changes..................    8
  Fund Termination...................    8
  Certificates.......................    9
  Trust Indenture....................    9
  Legal Opinion......................   10
  Auditors...........................   10
  Sponsors...........................   10
  Trustee............................   10
  Underwriters' and Sponsors'
    Profits..........................   10
  Public Distribution................   11
  Code of Ethics.....................   11
  Year 2000 Issues...................   11
Taxes................................   11
Supplemental Information.............   13
Financial Statements.................  D-1
</TABLE>

                                       2
<PAGE>
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RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 1.  WHAT IS THE FUND'S OBJECTIVE?
     The Fund seeks current interest income,
     safety of capital and flexibility by
     investing in a fixed, laddered portfolio
     of U.S. government agency bonds maturing
     2001- 2008 with an estimated life of 5
     years.

 2.  WHAT ARE U.S. GOVERNMENT AGENCY BONDS?
     These are directly issued by the Federal
     Home Loan Bank, the Federal Farm Credit
     Bank and the Tennessee Valley Authority
     to fund sectors of the U.S. economy such
     as agriculture, education,
     transportation, housing, electric power
     and deposit insurance. In return, they
     pay a fixed rate of interest and
     principal at maturity.

 3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?

  -  The Fund plans to hold to maturity 4
     short-and intermediate-term U.S.
     government agency bonds with a current
     aggregate face amount of $6,800,000.

  -  The Fund is a unit investment trust
     which means that, unlike a mutual fund,
     the Fund's portfolio is not managed.

  -  You will periodically receive your share
     of the principal received as each bond
     matures.
  -  100% of the Portfolio consists of U.S.
     government agency bonds.

  -  The bonds are rated Aaa by Moody's.
</TABLE>

<TABLE>
<C>  <S>
 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 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 will receive early returns of
     principal if securities are sold before
     they mature. 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.

  -  Because the bonds in the Fund were
     purchased at a premium, and current
     income includes distributions of
     principal and interest, an early
     redemption at par value will result in a
     reduction in yield to the Fund.

 5.  IS THIS FUND APPROPRIATE FOR YOU?

     Yes, if you want current monthly income
     exempt from state and local personal
     income taxes in all states. You will
     benefit from a professionally selected
     and supervised portfolio of U.S.
     government agency bonds.
     The Fund is NOT appropriate for you if
     you want a speculative investment that
     changes to take advantage of market
     movements or if you are a U.S. investor
     and want an investment free from federal
     income tax.
</TABLE>

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

<TABLE>
<C>  <S>
     WHAT YOU MAY EXPECT (Payable on the 25th day each
     month):
</TABLE>

<TABLE>
<C>  <S>                                            <C>
     Regular Monthly Income per 1,000 units:         $ 4.36
     Annual Income per 1,000 units:                  $52.38
     RECORD DAY: 10th day of each month

     THESE FIGURES ARE ESTIMATES ON THE EVALUATION DATE;
     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

                                          2.00%
     Maximum Sales Fee (Load) on new
     purchases (as a percentage of
     $1,000 invested)
</TABLE>

<TABLE>
<C>  <S>
     Employees of some of the Sponsors and their
     affiliates may be charged a reduced sales fee
     of no less than $5.00 per 1,000 Units.

     The maximum sales fee is reduced if you invest
     at least $500,000, as follows:
</TABLE>

<TABLE>
<CAPTION>
                                       YOUR MAXIMUM
                                        SALES FEE
            IF YOU INVEST:               WILL BE:
            --------------             ------------
<C>  <S>                           <C>
     Less than $500,000                      2.00%
     $500,000-$999,999                       1.50%
     $1,000,000 and over                     1.00%
</TABLE>

                                       3
<PAGE>

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

<TABLE>
<CAPTION>
                                                    AMOUNT
                                                      PER
                                                  1,000 UNITS
                                                  -----------
<C>  <S>                                          <C>
                                                    $ 0.59
     Trustee's Fee
                                                    $ 0.45
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees   (including
     updating
     expenses)
                                                    $ 0.19
     Evaluator's Fee
                                                    $   0.
     Organization Costs
                                                    $ 1.06
     Other Operating Expenses
                                                    ------
                                                    $ 2.29
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
     The Sponsors historically paid organization
     costs and updating expenses.

 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 $250.

     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 1,000 UNITS           $950.75
     (as of December 31, 1999)

     Unit price is based on the net asset value of
     the Fund plus the up-front 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 at a price at which the
     bonds can be directly purchased by the public
     assuming they were available. Unit price
     changes every day with changes in the prices of
     the bonds in the Fund.

 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. Interest on the
     bonds in this Fund is subject to federal income
     taxes for U.S. investors, but exempt from state
     and local personal income taxes. If you are a
     non-U.S. investor, your interest may be exempt
     from U.S. federal income taxes, including
     withholding taxes.

     You will also receive principal payments when
     the securities mature or if they are sold (when
     the cash available is more than $5.00 per 1,000
     units. You will be subject to tax on any gain
     realized by the Fund on the disposition of
     bonds.
</TABLE>

                                       4
<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 one or more securities from the Fund's portfolio because of
    redemptions or sales; or
  - a change in the Fund's expenses;

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

Along with your monthly income, you will receive your share of any available
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 securities 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 securities in the
Fund. It is an average of the yields to maturity of the individual securities 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 each
security's yield by its market value and the time remaining to the maturity
date.

Yields on individual securities 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 securities are deposited in exchange or
  substitution for securities 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 INTEREST RECEIVED DURING THE YEAR.

You may request:
- - copies of 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.

                                       5
<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, securities with longer maturities
will change in value more than securities with shorter maturities. Of course, we
cannot predict how interest rates may change.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell securities. This
could reduce the diversification of your investment and increase your share of
Fund expenses.

LITIGATION RISK

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

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 securities, 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 a 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

                                       6
<PAGE>
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 securities to be sold. Securities will be
selected based on market and credit factors. These sales could be made at times
when the securities 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 making sale or evaluation of the
    bonds not reasonably practicable; and
  - for any other period permitted by SEC order.

HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the securities, less expenses,
from the 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.

In addition, as with mutual funds, the Fund (and therefore the investors) pay
all or some of the costs of organizing the Fund including:
  - cost of initial preparation of legal documents;
  - federal and state registration fees;
  - initial fees and expenses of the Trustee;
  - initial audit; and
  - legal expenses and other out-of-pocket expenses.

EVALUATIONS

An independent Evaluator values the securities 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;
and the following federal holidays: Columbus Day and Veterans Day). Values are
based on current bid or offer prices for the securities or comparable bonds. In
the past, the difference between bid and offer prices of U.S. Treasury
securities of the type in this Fund has been about 0.10%.

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.

                                       7
<PAGE>
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;
  - 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 Portfolio's registration statement yearly are also
now chargeable to the Portfolio. 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 a security.

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

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 securities 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
security in the

                                       8
<PAGE>
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 securities 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.

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 securities, and you will receive your final
distribution. Any security 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 securities. 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

                                       9
<PAGE>
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;
  - 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
special counsel for the Sponsors, has given an opinion that the units are
validly issued.

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
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019

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--17W, 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 deposit of the securities. Any cash
made available by you to the Sponsors before the settlement date for those units
may be used in the Sponsors'

                                       10
<PAGE>
businesses to the extent permitted by federal law and may benefit the Sponsors.

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

Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.

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"). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund. The Year 2000 Problem may adversely affect the issuers of the securities
contained in the Portfolio, but 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.

The Sponsors believe that individual investors will not be subject to any state
or local personal income taxes on interest received by the Fund. However, you
may be subject to state and local taxes on capital gains (or "market discount"),
and possibly other state and local taxes on your units. Also, you probably will
not be entitled to a deduction for state and local tax purposes for your share
of fees and expenses paid by the Fund, for any amortized "bond premium" or for
any interest on money borrowed to purchase your units. You should consult your
tax adviser in this regard.

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 security in the Fund.

                                       11
<PAGE>
GAIN OR LOSS UPON DISPOSITION

When all or part of your share of a security is disposed of (for example, when
the Fund sells, exchanges or redeems a security or when you sell or exchange
your units), you will generally recognize capital gain or loss. Your gain,
however, will generally be ordinary income to the extent of any accrued "market
discount". Generally you will have market discount to the extent that your basis
in a security when you purchase a unit is less than its stated redemption price
at maturity (or, if it is an original issue discount security, the issue price
increased by original issue discount that has accrued on the security before
your purchase). You should consult your tax adviser in this regard.

If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each security for more than one year and short-term
otherwise. Because the deductibility of capital losses is subject to
limitations, you may not be able to deduct all of your capital losses. You
should consult your tax advisor in this regard.

YOUR BASIS IN THE SECURITIES

Your aggregate basis in the securities will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of "original issue discount," "acquisition premium" and
"bond premium". You should consult your tax adviser in this regard.

EXPENSES

If you are an individual who itemizes deductions, you may deduct your share of
Fund expenses, but only to the extent that such amount, together with your other
miscellaneous deductions, exceeds 2% of your adjusted gross income. Your ability
to deduct Fund expenses will be limited further if your adjusted gross income
exceeds a specified amount, currently, $128,950 ($64,475 for a married person
filing separately).

FOREIGN INVESTORS

If you are a foreign investor and you are not engaged in a U.S. trade or
business, you generally will not be subject to U.S. federal income tax,
including withholding tax, on the interest or gain on a security issued after
July 18, 1984 if you meet certain requirements, including the certification of
foreign status and other matters. You should consult your tax adviser about the
possible application of federal, state and local, and foreign taxes.

RETIREMENT PLANS

You may wish to purchase units for an Individual Retirement Account (IRA) or
other retirement plan. Generally, capital gains and income received in each of
these plans are exempt from such plans are generally treated as ordinary income
but may, in some cases, be eligible for tax-deferred rollover treatment. You
should consult your attorney or tax adviser about the specific tax rules
relating to these plans.

                                       12
<PAGE>
These plans are offered by brokerage firms, including the Sponsors of this Fund,
and other financial institutions. Fees and charges with respect to such plans
may vary.

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 securities that may be in the Fund's portfolio and general information
about the structure and operation of the Fund. The supplemental information is
also available from the SEC.

                                       13
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
  of Government Securities Income Fund,
  U.S. Government Laddered Agency Series - 1,
  Defined Asset Funds:

We have audited the accompanying statement of condition of Government Securities
Income Fund, U.S. Government Laddered Agency Series - 1, Defined Asset Funds,
including the portfolio, as of December 31, 1999 and the related statements of
operations and of changes in net assets for the period January 16, 1999 to
December 31, 1999. These financial statements are the responsibility of the
Trustee. Our responsibility is to express an opinion on these financial
statements based on our audit.

We conducted our audit 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
December 31, 1999, 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
audit provides 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 Government Securities Income
Fund, U.S. Government Laddered Agency Series - 1, Defined Asset Funds at
December 31, 1999 and the results of its operations and changes in its net
assets for the above-stated period in conformity with generally accepted
accounting principles.

DELOITTE & TOUCHE LLP

New York, N.Y.
March 27, 2000


                                      D - 1
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
AS OF DECEMBER 31, 1999

<TABLE>
<S>                                                <C>           <C>
TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $6,665,317)(Note 1)......................                  $6,399,155
  Accrued interest receivable......................                     106,775
                                                                   -------------

              Total trust property.................                   6,505,930

LESS LIABILITIES:
  Advance from Trustee.............................   $   15,169
  Accrued expenses.................................        7,507         22,676
                                                    -------------  -------------

NET ASSETS, REPRESENTED BY:
  6,868,000 units of fractional undivided
    interest outstanding (Note 3)..................    6,467,155
  Undistributed net investment income..............       16,099
                                                    -------------
                                                                      $6,483,254
                                                                   =============
UNIT VALUE ($6,483,254/6,868,000 units)............                    $0.94398
                                                                   =============

</TABLE>
                       See Notes to Financial Statements.


                                      D - 2
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                              January 16,
                                                 1999
                                                  to
                                             December 31,
                                                 1999
                                             -------------
<S>                                        <C>
INVESTMENT INCOME:
  Interest income...........................    $240,774
  Trustee's fees and expenses...............      (9,460)
  Sponsors' fees............................      (2,380)
                                             -------------
  Net investment income.....................     228,934

UNREALIZED DEPRECIATION OF INVESTMENTS......    (266,162)

NET DECREASE IN NET ASSETS RESULTING
  FROM OPERATIONS...........................    $(37,228)
                                             =============

</TABLE>
                       See Notes to Financial Statements.


                                      D - 3
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                January 16,
                                                   1999
                                                    to
                                               December 31,
                                                   1999
                                               -------------
<S>                                          <C>
OPERATIONS:
  Net investment income.......................  $  228,934
  Unrealized depreciation of investments......    (266,162)
                                               -------------
  Net decrease in net assets resulting
    from operations...........................     (37,228)

INCOME DISTRIBUTIONS TO HOLDERS (Note 2)......    (227,346)

CAPITAL SHARE TRANSACTIONS:
  Issuance of 6,464,000 units.................   6,336,697
                                               -------------

NET INCREASE IN NET ASSETS....................   6,072,123

NET ASSETS AT BEGINNING OF PERIOD.............     411,131
                                               -------------
NET ASSETS AT END OF PERIOD...................  $6,483,254
                                               =============
PER UNIT:
  Income distributions during period..........    $0.04733
                                               =============
  Net asset value at end of period............    $0.94398
                                               =============
TRUST UNITS OUTSTANDING AT END OF PERIOD......   6,868,000
                                               =============
</TABLE>
                       See Notes to Financial Statements.


                                      D - 4
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

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, except that value on January
          16, 1999 was based upon offer side evaluations at January 14, 1999,
          the day prior to the Date of Deposit. Cost of securities at January
          16, 1999 was also based on such offer side evaluations.

      (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

      Distributions of net investment income are made semi-annually. Receipts
      other than interest, after deductions for redemptions and applicable
      expenses, are also distributed periodically.

  3.  NET CAPITAL

<TABLE>
<S>                                                      <C>
      Cost of 6,868,000 units at Date of Deposit..........    $6,733,317
      Unrealized depreciation of investments..............      (266,162)
                                                           --------------

      Net capital applicable to Holders...................    $6,467,155
                                                           ==============
</TABLE>

  4.  INCOME TAXES

      As of December 31, 1999, unrealized depreciation of investments, based on
      cost for Federal income tax purposes, aggregated $266,162, all of which
      related to depreciated securities. The cost of investment securities for
      Federal income tax purposes was $6,665,317 at December 31, 1999.


                                      D - 5
<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

PORTFOLIO
AS OF DECEMBER 31, 1999

<TABLE>
<CAPTION>
                                           Rating of
    Portfolio No. and Title of             Moody's            Face
            Securities                     Investors(1)       Amount  Coupon  Maturities(3)         Cost(2)      Value(2)
            ----------                     ------------       ------  ------  -------------         -------      --------
<S>                                    <C>            <C>        <C>       <C>           <C>          <C>
 1 Federal Farm Mtn.                          Aaa(m)      $1,700,000   5.750%    2005            $1,688,073    $1,601,796

 2 Federal Home Loan Bank Board               Aaa(m)       1,700,000   5.500     2001             1,700,921     1,675,324

 3 Federal Home Loan Bank Board               Aaa(m)       1,700,000   5.125     2003             1,658,189     1,607,034

 4 Tennessee Valley Authority                 Aaa(m)       1,700,000   5.375     2008             1,618,134     1,515,001

                                                        --------------                         ------------- --------------
TOTAL                                                     $6,800,000                             $6,665,317    $6,399,155
                                                        ==============                         ============= ==============
                             See Notes to Portfolio.

</TABLE>


                                      D - 6

<PAGE>

GOVERNMENT SECURITIES INCOME FUND,
U.S. GOVERNMENT LADDERED AGENCY SERIES - 1,
DEFINED ASSET FUNDS

NOTES TO PORTFOLIO
AS OF DECEMBER 31, 1999

   (1) The ratings of the bonds are by Standard & Poor's Ratings Group, or by
       Moody's Investors Service, Inc. if followed by "(m)", or by Fitch
       Investors Service, Inc. if followed by "(f)"; "NR" indicates that this
       bond is not currently rated by any of the above-mentioned rating
       services. These ratings have been furnished by the Evaluator but not
       confirmed with the rating agencies.

   (2) See Notes to Financial Statements.

   (3) 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.


                                      D - 7
<PAGE>

DEFINED ASSET FUNDS--REGISTERED TRADEMARK--

<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         GOVERNMENT SECURITIES INCOME FUND
Request the most recent free             U.S GOVERNMENT AGENCY LADDERED SERIES
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.
                                         333-69539) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-2810).
                                         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.
                                                                     32730--4/00
</TABLE>
<PAGE>
                       GOVERNMENT SECURITIES INCOME FUND
                              DEFINED ASSET FUNDS
                       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 on Form S-6 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. 10 to the Registration
            Statement of Government Securities Income Fund, U.S. Treasury
            Series--7, 1933 Act File No. 33-28452).

    1.11.2-- Government Securities Income Fund Code of Ethics (incorporated by
            reference to Exhibit 1.11.2 to the Post Effective Amendment No. 10
            to the Registration Statement of Government Securities Income Fund,
            U.S. Treasury Series--7, 1933 Act No. 33-28452).

    4.1 --Consent of the Evaluator.

    5.1 --Consent of independent accountants.

    9.1 -- Information Supplement (incorporated by reference to Exhibit 9.1 to
          the Registration Statement of Government Securities Income Fund,
          Freddie Mac Series 12, 1933 Act File No. 33-56849.

                                      R-1
<PAGE>
                       GOVERNMENT SECURITIES INCOME FUND
                     U.S. GOVERNMENT AGENCY LADDERED SERIES
                              DEFINED ASSET FUNDS

                                   SIGNATURES

    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
GOVERNMENT SECURITIES INCOME FUND, U.S. GOVERNMENT AGENCY LADDERED SERIES,
DEFINED ASSET FUNDS (A UNIT INVESTMENT TRUST), HAS DULY CAUSED THIS 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
12TH DAY OF APRIL, 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 Executive Committee of the Board of
Directors of PaineWebber 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:              Number: 333-70593
</TABLE>

     GEORGE A. SCHIEREN
     JOHN L. STEFFENS
     By J. DAVID MEGLEN
       (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>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 33-55073
</TABLE>

     MARGO N. ALEXANDER
     TERRY L. ATKINSON
     BRIAN M. BAREFOOT
     STEVEN P. BAUM
     MICHAEL CULP
     REGINA A. DOLAN
     JOSEPH J. GRANO, JR.
     EDWARD M. KERSCHNER
     JAMES P. MacGILVRAY
     DONALD B. MARRON
     ROBERT H. SILVER
     MARK B. SUTTON
     By ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber 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 and 333-47553
</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

                                INTERACTIVE DATA
                          FINANCIAL TIMES INFORMATION
                           14 WALL STREET, 11th FLOOR
                            NEW YORK, NEW YORK 10005
                                 (212) 306-6596
                                FAX 212-306-6698

                                                                  April 12, 2000

<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: GOVERNMENT SECURITIES INCOME FUND,
    U.S. GOVERNMENT AGENCY LADDERED SERIES, DEFINED ASSET FUNDS
(A Unit Investment Trust) Units of Fractional Undivided Interest-Registered
Under the Securities Act of 1933, File No. 333-69539)

Gentlemen:

    We have examined the Registration Statement for the above captioned Fund.

    We hereby consent to the reference to Interactive Data Services, Inc. in the
Prospectus contained in the Post-Effective Amendment No. 1 to the Registration
Statement for the above captioned Fund and to the use of the evaluations of the
Obligations prepared by us which are referred to in such Prospectus and
Registration Statement.

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

                                          Very truly yours,
                                          JAMES PERRY
                                          Vice President



                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Sponsors and Trustee of
Government Securities Income Fund--U.S. Government Agency Laddered Series,
Defined Asset Funds

We consent to the use in this Post-Effective Amendment No. 1 to Registration
Statement No. 333-69539 of our opinion dated March 27, 2000 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading "How The Fund Works--Auditors" in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
April 12, 2000



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