NATIONAL MUNICIPAL TRUST SERIES 193 /NY/
S-6, 1998-09-22
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<PAGE>

   
As filed with the Securities and Exchange Commission on September 22, 1998    

                                            Registration No. 333-      
=============================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                            ______________________
                                   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:
                           NATIONAL MUNICIPAL TRUST
                                  Series 193    

B.    Name of depositor:
                      PRUDENTIAL SECURITIES INCORPORATED

C.    Complete address of depositor's principal executive office:
                              One Seaport Plaza
                               199 Water Street
                           New York, New York 10292

D.    Name and complete address of agent for service:
                                                            Copy to:
          LEE B. SPENCER, JR., ESQ.                  KENNETH W. ORCE, ESQ.
      PRUDENTIAL SECURITIES INCORPORATED            CAHILL GORDON & REINDEL
              One Seaport Plaza                         80 Pine Street
               199 Water Street                     New York, New York 10005
           New York, New York 10292

E.    Title and amount of securities being registered:
                     An indefinite number of Units of
                    National Municipal Trust, Series 193
                  Pursuant to Rule 24f-2 promulgated under
                the Investment Company Act of 1940 as amended       
                                  

F.    Proposed maximum aggregate offering price to the public of the
      securities being registered:
                               Indefinite      


G.    Approximate date of proposed sale to public:
      As soon as practicable after the effective date of the registration
      statement.
===========================================================================


      The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this
registration statement shall hereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until the registration statement
shall become effective on such date as the Commission, acting pursuant to said
Section 8(a), may determine.



<PAGE>


                           NATIONAL MUNICIPAL TRUST
                                    Series 193     

                            CROSS-REFERENCE SHEET

                   Pursuant to Rule 404(c) of Regulation C
                       under the Securities Act of 1933


                (Form N-8B-2 Items required by Instruction as
                        to the Prospectus in Form S-6)


            Form N-8B-2                                     Form S-6
            Item Number                               Heading in Prospectus

                   I.  Organization and General Information

1.    (a)   Name of Trust .........................)  Prospectus front cover
      (b)   Title of securities issued ............)

2.    Name and address of each depositor ..........   Sponsor; Prospectus back
                                                        cover

3.    Name and address of trustee .................   Trustee

4.    Name and address of each principal
        underwriter ...............................   Sponsor

5.    State of organization of trust ..............   The Trust

6.    Execution and termination of trust
        agreement .................................   Summary of Essential
                                                        Information; The
                                                        Trust; Amendment and
                                                        Termination of the
                                                        Indenture

7.    Changes of Name .............................)            *

8.    Fiscal year .................................)            *

9.    Litigation ..................................)            *

                  II.  General Description of the Trust and
                              Securities of the Trust

_______________________

*    Inapplicable, answer negative or not required.
                                     i
<PAGE>


10.   (a)   Registered or bearer securities .......)            *
      (b)   Cumulative or distributive
              securities ..........................             *
      (c)   Redemption ............................   Rights of Unit Holders
                                                        -- Redemption
      (d)   Conversion, transfer, etc. ............   Rights of Unit Holders
                                                        -- Redemption
      (e)   Periodic payment plan .................)            *
      (f)   Voting rights .........................             *
      (g)   Notice to certificateholders ..........   The Trust; Rights of
                                                        Unit Holders -- Reports
                                                        and Records; Sponsor
                                                        -- Responsibility;
                                                        Sponsor --
                                                        Resignation; Trustee
                                                        -- Resignation;
                                                        Amendment and
                                                        Termination of the
                                                        Indenture
      (h)   Consents required .....................   The Trust; Amendment and
                                                        Termination of the
                                                        Indenture
      (i)   Other provisions ......................   Tax Status

11.   Type of securities comprising units .........   Prospectus front cover;
                                                        The Trust

12.   Certain information regarding
        periodic payment certificates .............             *

13.   (a)   Load, fees, expenses, etc. ............   Summary of Essential
                                                        Information; Public
                                                        Offering of Units --
                                                        Public Offering Price;
                                                        Public Offering of
                                                        Units -- Sponsor's and
                                                        Underwriter's Profits;
                                                        Public Offering of
                                                        Units -- Volume
                                                        Discount; Public
                                                        Offering of Units --
                                                        Employee Discount;
                                                        Exchange Option;
                                                        Reinvestment Program;
                                                        Expenses and Charges;
                                                        Sponsor --
                                                        Responsibility
_______________________

*    Inapplicable, answer negative or not required.
                                  ii
<PAGE>


      (b)   Certain information regarding
              periodic payment certificates .......             *
      (c)   Certain percentages ...................   Summary of Essential
                                                        Information; Public
                                                        Offering of Units --
                                                        Public Offering Price;
                                                        Public Offering of
                                                        Units -- Profit of
                                                        Sponsor; Public
                                                        Offering of Units --
                                                        Volume Discount;
                                                        Public Offering of
                                                        Units -- Employee
                                                        Discount; Exchange
                                                        Option
      (d)   Price Differentials ...................   Public Offering of Units
                                                        -- Employee Discount
      (e)   Certain other fees, etc. payable
              by holders ..........................   Rights of Unit Holders
                                                        -- Certificates
      (f)   Certain other profits receivable
              by depositor, principal under-
              writer, trustee or affiliated
              persons .............................   The Trust -- Objectives
                                                        and Securities
                                                        Selection; Rights of
                                                        Unit Holders --
                                                        Redemption -- Purchase
                                                        by the Sponsor of
                                                        Units Tendered for
                                                        Redemption
      (g)   Ratio of annual charges to
              income ..............................             *

14.   Issuance of trust's securities ..............   The Trust; Rights of
                                                        Unit Holders --
                                                        Certificates

15.   Receipt and handling of payments from
        purchasers ................................             *

16.   Acquisition and disposition of under-
        lying securities ..........................   The Trust -- Portfolio
                                                        Summary; The Trust --
                                                        Objectives and
                                                        Securities Selection;
                                                        Rights of Unit Holders
_______________________

*    Inapplicable, answer negative or not required.
                               iii
<PAGE>


                                                        -- Redemption; Sponsor
                                                        - Responsibility

17.   Withdrawal or redemption ....................   Rights of Unit Holders
                                                        -- Redemption

18.   (a)   Receipt, custody and disposition
              of income ...........................   Rights of Unit Holders
                                                        -- Distribution of
                                                        Interest and
                                                        Principal; Rights of
                                                        Unit Holders - Reports
                                                        and Records
      (b)   Reinvestment of distributions .........   Reinvestment Programs
      (c)   Reserves or special funds .............   Expenses and Charges;
                                                        Rights of Unit Holders
                                                        -- Distribution of
                                                        Interest and Principal
      (d)   Schedule of distributions .............             *

19.   Records, accounts and reports ...............   Rights of Unit Holders
                                                        -- Distributions of
                                                        Interest and
                                                        Principal; Rights of
                                                        Unit Holders --
                                                        Reports and Records

20.   Certain miscellaneous provisions of
        trust agreement ...........................   Sponsor -- Limitations
                                                        on Liabil-
      (a)   Amendment .............................)    ity; Sponsor --
                                                        Resignation;
      (b)   Termination ...........................)  Trustee -- Limitations
                                                        on Liabil-
      (c)   and (d) Trustee, removal and                ity; Trustee -
              successor ...........................)    Resignation;
                                                        Amendment and
                                                        Termination of
      (e)   and (f) Depositor, removal and              the Indenture
              successor ...........................)  

21.   Loans to security holders ...................             *

22.   Limitation on liability .....................   The Trust -- Portfolio
                                                        Summary; Sponsor --
                                                        Limitations on
                                                        Liability; Trustee --
_______________________

*    Inapplicable, answer negative or not required.
                                  iv
<PAGE>


                                                        Limitations on
                                                        Liability; Evaluator
                                                        -- Limitations on
                                                        Liability

23.   Bonding arrangements ........................   Additional Information
                                                        -- Item A

24.   Other material provisions of trust
        agreement .................................             *


                      III.  Organization, Personnel and
                       Affiliated Persons of Depositor

25.   Organization of depositor ...................   Sponsor

26.   Fees received by depositor ..................             *

27.   Business of depositor .......................   Sponsor

28.   Certain information as to officials
        and affiliated persons of
        depositor .................................   Contents of Registration
                                                        Statement -- Part II

29.   Companies controlling depositor .............   Sponsor

30.   Persons controlling depositor ...............             *

31.   Payments by depositor for certain
        services rendered to trust ................)            *

32.   Payments by depositor for certain
        other services rendered to trust ..........)            *

33.   Remuneration of employees of depositor
        for certain services rendered to
        trust .....................................)            *

34.   Remuneration of other persons for
        certain services rendered to trust ........)            *

35.   Distribution of trust's securities
        in states .................................   Public Offering of Units
                                                        -- Public Distribution

_______________________

*    Inapplicable, answer negative or not required.
                                      v
<PAGE>


36.   Suspension of sales of trust's
        securities ................................)            *

37.   Revocation of authority to distribute .......)            *

38.   (a)   Method of distribution ................)            *
      (b)   Underwriting agreements ...............   Public Offering of Units
      (c)   Selling agreements ....................)            *

39.   (a)   Organization of principal under-
              writer ..............................)  Sponsor
      (b)   N.A.S.D. membership of principal
              underwriter .........................)  Sponsor

40.   Certain fees received by principal
        underwriter ...............................             *

41.   (a)   Business of principal underwriter .....   Sponsor
      (b)   Branch offices of principal
              underwriter .........................)            *
      (c)   Salesmen of principal underwriter .....)            *

42.   Ownership of trust's securities by
        certain persons ...........................)            *

43.   Certain brokerage commissions received
        by principal underwriter ..................)            *

44.   (a)   Method of valuation ...................   Summary of Essential
                                                        Information; Public
                                                        Offering of Units --
                                                        Public Offering Price;
                                                        Public Offering of
                                                        Units -- Public
                                                        Distribution; Public
                                                        Offering of Units --
                                                        Secondary Market
      (b)   Schedule as to offering price .........             *
      (c)   Variation in offering price to
              certain persons .....................   Public Offering of Units
                                                        -- Public
                                                        Distribution; Public
                                                        Offering of Units --
                                                        Volume Discount;
                                                        Public Offering of
                                                        Units -- Employee

_______________________

*    Inapplicable, answer negative or not required.
                                     vi
<PAGE>


                                                        Discount; Exchange
                                                        Option

45.   Suspension of redemption rights .............             *

46.   (a)   Redemption Valuation ..................   Summary of Essential
                                                        Information; Rights of
                                                        Unit Holders --
                                                        Redemption --
                                                        Computation of
                                                        Redemption Price per
                                                        Unit
      (b)   Schedule as to redemption price .......             *

47.   Maintenance of position in underlying
        securities ................................   Public Offering of Units
                                                        -- Secondary Market;
                                                        Rights of Unit Holders
                                                        -- Redemption --
                                                        Computation of
                                                        Redemption Price per
                                                        Unit; Rights of Unit
                                                        Holders -- Redemption
                                                        -- Purchase by the
                                                        Sponsor of Units
                                                        Tendered for
                                                        Redemption


                   IV.  Information Concerning the Trustee
                                   or Custodian

48.   Organization and regulation of
        trustee ...................................   Trustee

49.   Fees and expenses of trustee ................   Expenses and Charges

50.   Trustee's lien ..............................   Expenses and Charges --
                                                        Other Charges


                   V.  Information Concerning Insurance of
                               Holders of Securities

51.   Insurance of holders of trust's
        securities .................................  The Trust -- Insurance
                                                        on the Securities in
                                                        the Portfolio of an
                                                        Insured Trust
             

_______________________

*    Inapplicable, answer negative or not required.
                                   vii
<PAGE>


                          VI.  Policy of Registrant

52.   (a)   Provisions of trust agreement with
              respect to selection or elimina-
              tion of underlying securities .......   Prospectus front cover;
                                                        The Trust -- Portfolio
                                                        Summary; The Trust --
                                                        Insurance on the
                                                        Securities in the
                                                        Portfolio of an Insured
                                                        Trust; The Trust --
                                                        Objectives and 
                                                        Securities Selection;
                                                        Sponsor --            
                                                        Responsibility
      (b)   Transactions involving elimination
              of underlying securities ............             *
      (c)   Policy regarding substitution or
              elimination of underlying
              securities ..........................   Sponsor --
                                                        Responsibility
      (d)   Fundamental policy not otherwise
              covered .............................             *

53.   Tax status of trust .........................   Prospectus front cover;
                                                        Tax Status


                 VII.  Financial and Statistical Information

54.   Trust's securities during last ten
        years .....................................)            *

55.                                                )

56.   Certain information regarding periodic
        payment certificates ......................)            *

57.                                                )

58.                                                )

59.   Financial statements (Instruction 1(c)
        to Form S-6) ..............................   Statement of Financial
                                                        Condition of the Trust


_______________________

*    Inapplicable, answer negative or not required.
                               viii
<PAGE>


                  Subject to Completion, Dated September 22, 1998     


                                    [LOGO]


                           NATIONAL MUNICIPAL TRUST
                                  SERIES 193     
                          (A Unit Investment Trust)

                                                 Prudential Securities [LOGO]

              The attached final prospectus for a prior Series of National
Municipal Trust is hereby used as a preliminary prospectus for Series 193 of
the Trust.  The narrative information relating to the operation of this Series
and the structure of the final prospectus for this Series will be
substantially the same as that set forth in the attached prospectus.
Information with respect to pricing, the number of Units, dates and summary
information regarding the characteristics of securities to be deposited in
this Series is not now available and will be different from that included in
the attached final prospectus since each Series has a unique Portfolio.  The
ratings of the securities of this Series are expected to be comparable to
those of the securities in the previous Series.  However, the estimated
current return and estimated long-term return for this Series (which will
depend on the interest rates and prices of the securities to be deposited in,
and the estimated annual expenses of, this Series) may vary materially from
that of the previous Series.  Accordingly, the information contained herein
with regard to the previous Series should be considered as being presented for
informational purposes only.  Investors should contact account executives of
the Sponsor who will be informed of the expected effective date of this Series
and who will be supplied with complete information with respect to such Series
on the day of effectiveness of the registration statement relating to Units of
this Series.     

            Information contained herein is subject to completion or
amendment.  A registration statement relating to these securities has been
filed with the Securities and Exchange Commission.  These securities may not
be sold nor may offers to buy them be accepted prior to the time the
registration statement becomes effective.  This prospectus shall not
constitute an offer to sell or the solicitation of an offer to buy nor shall
there be any sale of these securities in any State in which such offer,
solicitation or sale would be unlawful prior to registration or qualification
under the securities laws of such state.



<PAGE>


                           NATIONAL MUNICIPAL TRUST
                                  SERIES 192


            The prospectus dated October 16, 1997, File No. 333-32405 is
hereby incorporated by reference.




<PAGE>


         PART II.  ADDITIONAL INFORMATION NOT REQUIRED IN PROSPECTUS

                      CONTENTS OF REGISTRATION STATEMENT


Item A -- Bonding Arrangements

            The employees of Prudential Securities Incorporated are covered
under Broker's Blanket Policies, Standard Form No. 14 in the aggregate amount
of $62,500,000.

Item B -- Contents of Registration Statement

            This Registration Statement on Form S-6 comprises the following
papers and documents:

            The cross-reference sheet.

            The Prospectus.

            Signatures.

              Listed below is the name and registration number of a previous
series of National Municipal Trust, the final prospectus of which, properly
supplemented, is used as a preliminary prospectus for National Municipal
Trust, Series 193.  This prior final prospectus is incorporated herein by
reference.

      National Municipal Trust, 
      Series 192
      (Registration No. 333-32405)     


            Written consents of the following persons:

                  Cahill Gordon & Reindel (included in Exhibit 5).

              (2) Deloitte & Touche LLP

                  Kenny S&P Evaluation Services, a division of J.J. 
                  Kenny Co., Inc. (as Evaluator) (included in 
                  Exhibit 23).

            The following Exhibits:

      (4) Ex-3.(i)      -     Certificate of Incorporation of Prudential
                                Securities Incorporated dated March 29, 1993.

      (8) Ex-3.(ii)     -     Revised By-Laws of Prudential Securities
                                Incorporated as amended through June 21, 1996.


                                   II-1
<PAGE>


      (5)   Ex-4.a      -     Trust Indenture and Agreement, dated September
                                6, 1989.

      (1)   Ex-4.b      -     Draft of Reference Trust Agreement.

      (2)   Ex-5        -     Opinion of counsel as to the legality of the
                                securities being registered.

      (2)   Ex-23       -     Consent of Kenny S&P Evaluation Services, a      
                                division of J.J. Kenny Co., Inc. (as
                                Evaluator).

      (2)   Ex-27       -     Financial Data Schedule.

      (7)   Ex-24       -     Powers of Attorney executed by a majority of the
                                Board of Directors of Prudential Securities
                                Incorporated.

      (6)   Ex-99       -     Form of Agreement Among Underwriters.

            Ex-99.1     -     Information as to Officers and Directors of
                                Prudential Securities Incorporated is
                                incorporated by reference to Schedules A and D
                                of Form BD filed by Prudential Securities
                                Incorporated pursuant to Rules 15b1-1 and
                                15b3-1 under the Securities Exchange Act of
                                1934 (1934 Act File No. 8-16267).

      (3)   Ex-99.2     -     Affiliations of Sponsor with other investment
                                companies.

      (3)   Ex-99.3     -     Broker's Blanket Policies, Standard Form No. 14
                                in the aggregate amount of $62,500,000.

      (5)   Ex-99.4     -     Investment Advisory Agreement.

____________________

   (1)  Filed herewith.

   (2)  To be filed by amendment.

   (3)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of Prudential Unit Trusts,
        Insured Tax-Exempt Series 1, Registration No. 2-89263.

   (4)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of Government Securities
        Equity Trust Series 5, Registration No. 33-57992.

   (5)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of National Municipal Trust,
        Insured Series 43, Registration No. 33-29314.

   (6)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of National Municipal Trust,
        Series 169, Registration No. 33-53569.

   (7)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of National Municipal Trust,
        Series 172, Registration No. 33-54681, National Equity Trust, Top       
        Ten Portfolio Series 3, Registration No. 333-15919 and National Equity  
        Trust, Low Five Portfolio Series 17, Registration No. 333-44543.

   (8)  Incorporated by reference to exhibit of same designation filed with the
        Securities and Exchange Commission as an exhibit to the Registration
        Statement under the Securities Act of 1933 of National Municipal Trust,
        Series 186, Registration No. 33-54697.


                                     II-2
<PAGE>


                                  SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
registrant, National Municipal Trust, Series 193, has duly caused this
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 22nd
day of September, 1998.      

                           NATIONAL MUNICIPAL TRUST
                                   SERIES 193      
                                 (Registrant)


                    By PRUDENTIAL SECURITIES INCORPORATED
                                 (Depositor)



                  By the following persons*, who constitute
                   a majority of the Board of Directors of
                      Prudential Securities Incorporated

                              Alan D. Hogan        
                              A. Laurence Norton, Jr.
                              Leland B. Paton
                              Martin Pfinsgraff
                              Vincent T. Pica II   
                              Hardwick Simmons     
                              Lee B. Spencer, Jr.
                              Brian M. Storms
                              James D. Price

                              
                              By /s/ Kenneth Swankie
                              (Kenneth Swankie,
                              Senior Vice President,  
                              Manager-Unit Investment Trust Department,
                              As authorized signatory
                              for Prudential Securities
                              Incorporated and         
                              Attorney-in-Fact for the
                              persons listed above)  
                             
____________________

*     Pursuant to Powers of Attorney previously filed.

                                 II-3



                              CONSENT OF COUNSEL


            The consent of Cahill Gordon & Reindel to the use of its name in
the Prospectus included in this Registration Statement will be contained in
its opinion to be filed as Exhibit 5 to this Registration Statement.

                           _______________________


                       CONSENT OF INDEPENDENT AUDITORS


                          [to be filed by Amendment]


                                    II-4




<PAGE>


                                                    Exhibit 4.b


                                        Executed in 7 Parts    
                                          Counterpart No. (   )



                   NATIONAL MUNICIPAL TRUST

                          SERIES 193

                   REFERENCE TRUST AGREEMENT


          This Reference Trust Agreement dated            , 1998
among Prudential Securities Incorporated, as Depositor, The
Chase Manhattan Bank, as Trustee, and Kenny S&P Evaluation 
Services, a division of J.J. Kenny Co., Inc., as Evaluator, 
sets forth certain provisions in full and incorporates other 
provisions by reference to the document entitled "National 
Municipal Trust, Trust Indenture and Agreement" (the "Basic 
Agreement") dated September 6, 1989, as amended.  Such 
provisions as are incorporated by reference constitute a 
single instrument (the "Indenture"). 


                       WITNESSETH THAT:


          In consideration of the premises and of the mutual
agreements herein contained, the Depositor, the Trustee, and
the Evaluator agree as follows: 


                            Part I.

            STANDARD TERMS AND CONDITIONS OF TRUST


          Subject to the provisions of Part II hereof, all the
provisions contained in the Basic Agreement are herein
incorporated by reference in their entirety and shall be deemed
to be a part of this instrument as fully and to the same extent
as though said provisions had been set forth in full in this
instrument except that the Basic Agreement is hereby amended in
the following manner:

     A.   Article I, entitled "Definitions" shall be amended to
          add the following numbered paragraphs and renumber
          the succeeding paragraphs accordingly:


<PAGE>


                                       -2-


               "1.  "Additional Bonds" shall mean such Bonds
          (as defined herein) as are listed in schedules of
          a Supplemental Reference Trust Agreement and which
          are deposited in connection with an increase in
          the number of Units initially specified in a
          Reference Trust Agreement."

               "2.  "Additional Deposited Units" shall mean
          such Deposited Units (as defined herein) as are
          listed in schedules of a Supplemental Reference
          Trust Agreement and which are deposited in
          connection with an increase in the number of Units
          initially specified in a Reference Trust
          Agreement."

               "3.  "Additional Securities" shall mean such
          Securities (as defined herein) as are listed in
          schedules of a Supplemental Reference Trust
          Agreement and which are deposited in connection
          with an increase in the number of Units initially
          specified in a Reference Trust Agreement.
          "Additional Securities" may consist of "Additional
          Bonds" and/or "Additional Deposited Units."

               "4.  "Additional Units" shall mean such Units
          (as defined herein) as are issued in respect of
          Additional Securities."

               "11. "Deferred Sales Charge" shall mean any
          deferred sales charge payable in accordance with
          the provisions of Section 3.15 hereof, as set
          forth in the prospectus for a Trust."

               "32. "Supplemental Reference Trust Agreement"
          shall mean a document pursuant to which Additional
          Units are deposited in connection with an increase in
          the number of Units initially specified in a
          Reference Trust Agreement."

          and to insert the following language in renumbered
          paragraph (6) defining "Bonds" after each reference
          to Reference Trust Agreement:

               "and Supplemental Reference Trust
               Agreements"

          and to replace the last word in renumbered paragraph
          (6) defining "Bonds" with the word "relate"




<PAGE>

                                       -3-


          and to insert the following language in renumbered
          paragraph (10) defining "Contract Bonds" after the
          reference to Reference Trust Agreement and
          redesignate the subsequent clause accordingly:

               "(ii) Bonds listed in schedules of
               Supplemental Reference Trust Agreements"

          and to add the following language to the end of
          renumbered paragraph (28) defining "Securities":

               "deposited in trust and listed on a
               schedule attached to the Reference Trust
               Agreement or on any schedule of a
               Supplemental Reference Trust Agreement."

          and to amend renumbered paragraph (33) defining
          "Trustee" as follows:

               "Trustee shall mean The Chase Manhattan
               Bank, or any successor trustee appointed as
               hereinafter provided."

          and to add the following language to the end of
          renumbered paragraph (36) defining "Unit":

               "hereof and increased by the number of
               Additional Units created pursuant to
               Section 2.05 hereof."

     B.   Article II, entitled "Deposit of Securities;
          Acceptance of Trust; Issuance of Units; Form of
          Certificates", shall be amended to add a new Section
          2.05 entitled "Deposit of Additional Securities" to
          read as follows:

               "From time to time and in the discretion
               of the Depositor, the Depositor may make
               deposits of Additional Securities duly
               endorsed in blank or accompanied by all
               necessary instruments of assignment and
               transfer in proper form (or contracts to
               purchase Additional Securities and cash
               or an irrevocable letter of credit in an
               amount necessary to consummate the
               purchase of any Additional Securities
               pursuant to such contracts ("Additional
               Contract Securities")) and Cash (as
               defined below), if Cash is an asset of



<PAGE>

                                       -4-


               the Trust immediately prior to the
               supplemental deposit, provided that each
               deposit of Additional Securities and
               Cash, if any, deposited during the
               90-day period following the first
               deposit of Securities in the Trust shall
               replicate, to the extent practicable as
               hereinafter provided, the Securities
               (including Contract Bonds) and shall
               exactly replicate Cash (other than Cash
               to be distributed only to the Sponsor or
               in respect of Units issued and
               outstanding prior to the deposit) held
               in the Trust immediately prior to each
               such deposit; and, provided further that
               each deposit of Additional Securities
               and Cash, if any, subsequent to such
               90-day period shall exactly replicate
               the Securities (including Contract
               Bonds) and Cash (other than Cash to be
               distributed only to the Sponsor or in
               respect of Units issued and outstanding
               prior to the deposit) held in the Trust
               immediately prior to each such deposit.
               For purposes of this Section 2.05 Cash
               means cash on hand in the Trust and/or
               cash receivable by the Trust as of the
               date of the supplemental deposit in
               respect of a coupon date which has
               occurred on or before the date of such
               supplemental deposit, reduced by
               payables and accrued expenses on such
               date, but shall not include cash
               received on any Security which is
               allocable to the amount paid to the Unit
               Holders of record on the first
               settlement date for the Trust. 

                    Accordingly, for a deposit
               subsequent to the 90-day period
               following the first deposit of
               Securities:

                    (l)  Any Additional Bonds included
               in a deposit shall be identical to Bonds
               held in the Trust immediately prior to
               the deposit and in face amounts such
               that (i) the face amount of Additional
               Bonds of a particular issue included in
               a deposit divided by (ii) the aggregate



<PAGE>

                                       -5-


               of the face amounts of all Additional
               Bonds included in the deposit results in
               a fraction which is the same as the
               fraction resulting from division of
               (iii) the aggregate face amount of the
               Bonds of the same issue held in the
               Trust divided by (iv) the aggregate face
               amount of all Bonds held in the Trust
               immediately prior to the deposit;

                    (2)  Any deposit of Additional
               Securities shall be accompanied by Cash
               in an amount bearing the same ratio to
               the aggregate face amount of all
               Additional Bonds in the deposit as the
               Cash held in the Trust immediately prior
               to the deposit bears to the aggregate
               face amount of all Bonds held in the
               Trust immediately prior to the deposit,
               exclusive of Cash held in the Trust and
               designated for distribution only to the
               Sponsor or with respect to Units issued
               and outstanding prior to the deposit;
               and

                    (3)  Any Additional Deposited Units
               included in a deposit shall be identical
               with Deposited Units then held in the
               Trust and shall be in numbers determined
               by multiplying the number of Deposited
               Units with respect to a particular prior
               series of the National Municipal Trust
               held in the Trust immediately prior to
               the deposit by the fraction obtained by
               dividing the face amount of all
               Additional Bonds included in the deposit
               by the face amount of all Bonds included
               in the Trust immediately prior to the
               deposit; 

               and for a deposit during the 90-day
               period following the first deposit of
               Securities in the Trust, the rules
               stated in paragraphs (1), (2) and (3) of
               this Section 2.05 shall apply except
               that any Additional Securities
               (including Additional Contract
               Securities) need be only substantially
               similar (rather than identical to)
               Securities held in the Trust immediately



<PAGE>
                                       -6-


               prior to the deposit and the
               proportionality requirements need be met
               only to the extent practicable.  Without
               limiting the generality of the phrase
               "to the extent practicable", if the
               Depositor specifies a minimum face
               amount of a Bond or minimum number of
               Deposited Units with respect to a
               particular trust to be included in a
               deposit and such minimum requirement
               cannot be met or if a Security identical
               to a Security held in the Trust is not
               readily obtainable, substitution of
               other substantially similar Securities
               (including Securities of an issue
               originally deposited) in order to meet
               the foregoing proportionality
               requirements shall be considered as a
               meeting of such requirements "to the
               extent practicable".

               Each deposit of Additional Securities
               shall be listed in and made in
               accordance with a Supplementary Schedule
               to the Reference Trust Agreement stating
               the date of such deposit and the number
               of Additional Units being issued
               therefor.  The execution by the
               Depositor in connection with the deposit
               of Additional Securities of a
               Supplementary Schedule to the Reference
               Trust Agreement shall constitute the
               approval by the Depositor as
               satisfactory in form and substance of
               the contracts to be entered into or
               assumed by the Trustee with regard to
               any Additional Securities listed on such
               Supplementary Schedule and authorization
               to the Trustee on behalf of the Trust to
               enter into or assume such contracts and
               otherwise to carry out the terms and
               provisions thereof or to take other
               appropriate action in order to complete
               the deposit of the Additional Securities
               covered thereby into the Trust."

    C.   Article III, entitled "Administration of Trust", shall
         be amended as follows:





<PAGE>

                                       -7-


          (i)  Section 3.01 Initial Costs shall be
               amended to substitute the following
               language: 

               Section 3.01. Initial Cost The costs 
               of organizing the Trust and sale of the
               Trust Units shall, to the extent of 
               the expenses reimbursable to the 
               Depositor provided below, be borne by 
               the Unit Holders, provided, however, 
               that, to the extent all of such costs 
               are not borne by Unit Holders, the 
               amount of such costs not borne by Unit 
               Holders shall be borne by the Depositor 
               and, provided further, however, that 
               the liability on the part of the Depositor 
               under this section shall not include 
               any fees or other expenses incurred in 
               connection with the administration of 
               the Trust subsequent to the deposit 
               referred to in Section 2.01. Upon 
               notification from the Depositor that 
               the primary offering period is concluded, 
               the Trustee shall withdraw from the 
               Account or Accounts specified in the 
               Prospectus or, if no Account is therein 
               specified, from the Principal Account, 
               and pay to the Depositor the Depositor's 
               reimbursable expenses of organizing the 
               Trust and sale of the Trust Units in an 
               amount certified to the Trustee by the 
               Depositor.  If the balance of the Principal 
               Account is insufficient to make such 
               withdrawal, the Trustee shall, as directed 
               by the Depositor, sell Securities identified 
               by the Depositor, or distribute to the 
               Depositor Securities having a value, as 
               determined under Section 4.01 as of the 
               date of distribution, sufficient for such 
               reimbursement.  The reimbursement provided 
               for in this section shall be for the account 
               of the Unitholders of record at the conclusion 
               of the primary offering period and shall 
               not be reflected in the computation of the 
               Unit Value prior thereto.  As used herein, 
               the Depositor's reimbursable expenses of 
               organizing the Trust and sale of the Trust 
               Units shall include the cost of the initial 
               preparation and typesetting of the registration 
               statement, prospectuses (including preliminary 
               prospectuses), the indenture, and other 
               documents relating to the Trust, SEC and 
               state blue sky registration fees, the cost 
               of the initial valuation of the portfolio 
               and audit of the Trust, the initial fees 
               and expenses of the Trustee, and legal and 
               out-of-pocket expenses related thereto, but 
               not including the expenses incurred in the 
               preparation and printing of preliminary 
               prospectuses and prospectuses, expenses 
               incurred in the preparation and printing 
               of brochures and other advertising materials 
               and any other selling expenses.  Any cash 
               which the Depositor has identified as to be used 
 

<PAGE>

                                  -8-


               for reimbursement of expenses pursuant 
               to this Section shall be reserved by the 
               Trustee for such purpose and shall not 
               be subject to distribution or, unless 
               the Depositor otherwise diects, used for 
               payment of redemptions in excess of the 
               per-Unit amount allocable to Units tendered 
               for redemption.
               

         (ii)  section 3.05 Distribution shall be
               amended by replacing "$1.00" with
               "$5.00" in the first and last sentences
               of the third paragraph;

        (iii)  section 3.05 shall be further amended to
               add the following paragraph after the
               end thereof:  "On each Deferred Sales
               Charge payment date set forth in the
               prospectus for a Trust, the Trustee
               shall pay the account created pursuant
               to Section 3.15 the amount of the
               Deferred Sales Charge payable on each
               such date as stated in the prospectus
               for a Trust.  Such amount shall be
               withdrawn from the Principal Account and
               the Income Account from the amounts
               therein designated for such purpose or
               otherwise deducted from such accounts." 

         (iv)  sections 3.06 A(3) and 3.06B(3) shall be
               amended by adding the following:  "and
               any Deferred Sales Charge paid".

          (v)  section 3.07 shall be amended by adding
               the following at the end thereof:  "In
               order to pay the Deferred Sales Charge,
               the Trustee shall sell or liquidate such
               an amount of Securities at such time and
               from time to time and in such manner as
               the Depositor shall direct such that the



<PAGE>

                                       -9-


               proceeds of such sale or liquidation
               shall be sufficient to pay the amount
               required to be paid to the Depositor
               pursuant to the Deferred Sales Charge
               program as set forth in the prospectus
               for a Trust."

         (vi)  section 3.14 Replacement Bond shall be
               amended by deleting from part (vi) of
               the second sentence the words "in the
               category A or better" and inserting
               after the word "organization" the words
               "in the same category as the Contract
               Bond which it replaces";

     D.   Section 3.15 shall be added as follows:

          Section 3.15.  Deferred Sales Charge.  If the
          Reference Trust Agreement and prospectus for a Trust
          specifies a Deferred Sales Charge, the Trustee shall,
          on the dates specified in and as permitted by the
          prospectus, withdraw from the Income Account or from
          the Principal Account, as directed by the Depositor,
          an amount per Unit specified in the prospectus and
          credit such amount to a special, non-Trust account
          maintained at the Trustee out of which the Deferred
          Sales Charge will be distributed to the Depositor.
          If the balances in the Income and Principal Accounts
          are insufficient to make any such withdrawal, the
          Trustee shall, as directed by the Depositor, either
          advance funds in an amount equal to the proposed
          withdrawal and be entitled to reimbursement of such
          advance upon the deposit of additional monies in the
          Income Account or the Principal Account, sell
          Securities and credit the proceeds thereof to such
          special Depositor's Account or credit Securities in
          kind to such special Depositor's Account.  Such
          directions shall identify the Securities, if any, to
          be sold or distributed in kind and shall contain, if
          the Trustee is directed by the Depositor to sell a
          Security, instructions as to execution of such sales.
          If a Unit Holder redeems Units prior to full payment
          of the Deferred Sales Charge, the Trustee shall, if
          so provided in the Reference Trust Agreement and
          prospectus, on the Redemption Date, withhold from the
          Redemption Price payment to such Unit Holder an
          amount equal to the unpaid portion of the Deferred
          Sales Charge as such amount is certified by the
          Depositor to the Trustee prior to the Redemption
          Date, upon which certification the Trustee shall be



<PAGE>

                                      -10-


          entitled to rely, and distribute such amount to such
          special Depositor's Account or, if the Depositor
          shall purchase such Unit pursuant to the terms of
          Section 5.02 hereof, the Depositor shall pay the
          Redemption Price for such Unit less the unpaid
          portion of the Deferred Sales Charge.  The Depositor
          may at any time instruct the Trustee to distribute to
          the Depositor cash or Securities previously credited
          to the special Depositor's Account.

     E.   Article V, entitled "Trust Evaluation; Redemption,
          Purchase, Transfer, Interchange or Replacement of
          Certificates," Section 5.01 Trust Evaluation shall be
          amended as follows:

          (i)  the second sentence of the first
               paragraph of Section 5.01 shall be
               amended by deleting the word "and"
               appearing immediately prior to
               subsection (3) of such sentence and
               inserting the following at the end of
               such sentence:  ", and (4) amounts
               representing organizational expenses
               paid less amounts representing accrued
               organizational expenses of a Trust."

         (ii)  The following shall be added at the end
               of the first paragraph of Section 5.01:

                    Until the Depositor has informed the
               Trustee that there will be no further deposits
               of Additional Securities pursuant to section
               2.05, the Depositor shall provide the Trustee
               with written estimates of (i) the total
               organizational expenses to be borne by the Trust
               pursuant to Section 3.01 and (ii) the total
               number of Units to be issued in conneciton with
               the initial deposit and all anticipated deposits
               of Additional Securities.  For purposes of
               calculating the value of the Trust and Unit
               Value, the Trustee shall treat all such
               anticipated expenses as having been paid and all
               liabilities therefor as having been incurred,
               and all Units as having been issued, in each
               case on the date of the Reference Trust
               Agreement, and, in connection with each such
               calculation, shall take into account a pro rata
               portion of such expense and liability based on
               the actual number of Units issued as of the date
               of such calculation.  In the event the Trustee



<PAGE>
                                      -11-


               is informed by the Depositor of a revision in
               its estimate of total expenses or total Units
               and upon the conclusion of the deposit of
               Additional Securities, the Trustee shall base
               calculations made thereafter on such revised
               estimates or actual expenses, respectively, but
               such adjustment shall not affect calculations
               made prior thereto and no adjustment shall be
               made in respect thereof.

     F.   Article VI, entitled "Trustee", section 6.01 General
          Definition of Trustee's Liabilities, Rights and
          Duties shall be amended as follows:

          (i)  Section 6.01(g) shall be amended by deleting the
               word "originally"

         (ii)  Section 6.01(g) shall be amended by inserting
               the phrase "including supplemental deposits, if
               any, of Securities in the Trust" after the first
               reference to "Trust".

     G.   Article IX, entitled "Additional Covenants;
          Miscellaneous Provisions", Section 9.01 Amendments
          shall be amended as follows:

          (i)  To add the following phrase after the word
               "Indenture" in (1):

               "except as the result of the deposit of
               Additional Securities, as herein
               provided"

          (ii) To add the following phrase after the word
               "Bonds" in (2):

               "except in the manner permitted by the
               Indenture as in effect on the first
               deposit of Securities".

     H.   Reference to Standard & Poor's Corporation in their
          capacity as Evaluator is replaced by Kenny S&P
          Evaluation Services, a division of J.J. Kenny Co.,
          Inc., throughout the Basic Agreement.

     I.   Reference to Prudential-Bache Securities Inc. in
          their capacity as Sponsor is replaced by Prudential
          Securities Incorporated throughout the Basic
          Agreement.




<PAGE>

                                      -12-


     J.   Reference to United States Trust Company of New York
          in its capacity as Trustee is replaced by The Chase
          Manhattan Bank throughout the Basic Agreement.


                           Part II.

             SPECIAL TERMS AND CONDITIONS OF TRUST


          The following special terms and conditions are hereby
agreed to: 

          A.   The Trust is denominated National Municipal
Trust, Series 193 (the "National Trust").

          B.   The interest-bearing obligations listed in
Schedule A hereto are those which, subject to the terms of this
Indenture, have been or are to be deposited in trust under this
Indenture.

          C.   The term "Depositor" shall mean Prudential
Securities Incorporated.

          D.   The aggregate number of Units referred to in
Sections 2.03 and 9.01 of the Basic Agreement is       .

          E.   A Unit is hereby declared initially equal to
1/      th.

<PAGE>


          F.   The term "First Settlement Date" shall mean
         , 1998.

          G.   The term "Computation Date" shall mean
       10, 1998.

          H.   The term first "Distribution Date" shall mean
       25, 1998.

          I.   The term "Monthly Record Date" shall mean the
tenth day of each month commencing        10, 1998.

          J.   The term "semi-annual Record Date shall mean the tenth day of
July and January of each year commencing            10, 1998.

          K.   The term "Monthly Distribution Date"  shall mean
the twenty-fifth day of each month following a Monthly Record
Date commencing        25, 1998.

          L.   The term "Semi-annual Distribution Date"  shall mean
the twenty-fifth day of each month following each Semi-annual Record
Date commencing        25, 1998.

          M.   The Trust will terminate on the date of
maturity, redemption, sale or other disposition of the last
Security held in the Trust.
 
          N.   The first distribution to Monthly and Semi-annual Unit Holders
will be a distribution in the amount of $       .

          O.   The first distribution to Monthly Unit Holders
will be a full distribution in the amount of $       .

          P.   For purposes of this Series -- National
Municipal Trust, Series 193 -- the form of Certificate set
forth in this Indenture shall be appropriately modified to
reflect the title of this Series and such of the Special Terms
and Conditions of Trust set forth herein as may be appropriate.

          Q.   The Sponsor's Annual Portfolio Supervision Fee
shall be a maximum of $     per $1,000 principal amount of
underlying Bonds.

          R.   The Trustee's Annual Fee as set forth in the
Indenture in Section 6.04 shall be $      per $1,000 principal
amount of Bonds under the monthly distribution option.

          S.   The term "Insurer" may mean AMBAC Indemnity Corporation
("AMBAC"), Capital Markets Assurance Corporation ("CapMAC"), Capital Guaranty
Insurance Company ("Cap. Gty."), Connie Lee Insurance Co. ("Connie Lee"),
Financial Guaranty Insurance Company ("FGIC"), Financial Security Assurance
("FSA"), Municipal Bond Insurance Association ("MBIA") and/or Municipal Bond
Investors Assurance Corporation ("MBIAC").

      [Signatures and acknowledgments on separate pages]



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