UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 13)

                                MATEC CORPORATION
                             -----------------------
                                (Name of Issuer)

                          Common Stock, par value $.05
                         ------------------------------
                         (Title of Class of Securities)

                                    576668107
                                 --------------
                                 (CUSIP Number)

                             Theodore S. Valpey, Jr.
                P.O. Box 4100, Portsmouth, NH 03802 603-431-2163
           ----------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 January 5, 2001
           ----------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box / /.


* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the  Securities  Exchange Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


CUSIP No. 576668107
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                                  SCHEDULE 13D

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(1)  NAMES OF REPORTING PERSONS.
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON.

     Theodore S. Valpey, Jr.
     ###-##-####
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(2)  CHECK THE APPROPRIATE BOX IF A                (a) / /
     MEMBER OF A GROUP*                            (b) /X/

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(3)  SEC USE ONLY

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(4)  SOURCE OF FUNDS*

     PF
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(5)  CHECK BOX IF DISCLOSURE OF LEGAL                  / /
     PROCEEDINGS IS REQUIRED PURSUANT
     TO ITEMS 2(d) or 2(e)

     Not applicable.
- -------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
- -------------------------------------------------------------------------------
NUMBER OF SHARES     (7)  SOLE VOTING POWER
BENEFICIALLY
OWNED BY EACH             1,045,552
REPORTING PERSON     --------------------------------------
WITH                 (8)  SHARED VOTING POWER

                          ---
                     --------------------------------------
                     (9)  SOLE DISPOSITIVE POWER

                          1,045,552
                     --------------------------------------
                     (10) SHARED DISPOSITIVE POWER

                          ---
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
     PERSON

      1,045,552 shares



CUSIP No. 576668107
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(12) CHECK BOX IF THE AGGREGATE AMOUNT IN               / /
     ROW (11) EXCLUDES CERTAIN SHARES*

- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     25.3%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON*

     IN
- -------------------------------------------------------------------------------

                        AMENDMENT NO. 13 TO SCHEDULE 13D


This  Amendment No. 13 to Schedule 13D relates to the Common  Stock,  par value
$.05 per share, of MATEC Corporation (the "Company").  This Amendment No. 13
amends the initial statement on Schedule 13D filed by Theodore S. Valpey Jr.
with the Securities and Exchange Commission (the "Initial Statement"), as
previously amended.  Capitalized terms used but not defined below shall have the
meanings ascribed to them in the Initial Statement.  The Initial Statement, as
previously amended, is further amended as follows:


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

Item 3, as heretofore amended, is further amended by the addition of the
following paragraph:

The aggregate purchase price of the 13,650 shares of Common Stock (adjusted for
the 3 for 2 stock split effective November 27, 2000) of the Company purchased by
Mr. Valpey in the period May 1999 to September 1999 is $34,802.80.  Mr. Valpey
used his personal funds to purchase such shares of Common Stock.


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

Item 5, as  heretofore  amended,  is  further  amended  by the  addition  of the
following:

(a) As of the close of  business  on January 5, 2001,  Mr.  Valpey  beneficially
owned 1,045,552 shares of the Company  representing  approximately  25.3% of the
outstanding Common Stock of the Company.

(c) Mr.  Valpey made gifts of 23,000 shares of Common Stock on November 28, 2000
and 37,000 shares of Common Stock on January 5, 2001.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        THE SECURITIES OF THE ISSUER

Item 6, as heretofore amended, is further amended to read in its entirety as
follows:

Mr. Valpey is not a party to any contract, arrangement, understanding or
relationship with respect to any Common Stock of the Company, including but not
limited to, any contract, arrangement, understanding or relationship concerning
the transfer or the voting of any Common Stock, finders fees, joint ventures,
loan or option arrangements, puts or calls, guarantees of profits, divisions of
profits or losses, or the giving or withholding of proxies.




CUSIP No. 576668107
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                                    SIGNATURE

After  reasonable  inquiry  and to the  best of my  knowledge  and  belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.

Dated:  January 16, 2001

                              /s/ Theodore S. Valpey, Jr.
                              -----------------------------
                              Theodore S. Valpey, Jr.