SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                    FORM 10-K
    (mark one)
    [ X ] Annual Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the fiscal year ended January 3, 1998

    [   ] Transition Report Pursuant to Section 13 or 15(d) of the
          Securities Exchange Act of 1934

                         Commission file number 1-10574

                               THERMO VOLTEK CORP.
             (Exact name of Registrant as specified in its charter)

    Delaware                                                       13-1946800
    (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                        Identification No.)

    470 Wildwood Street, P.O. Box 2878
    Woburn, Massachusetts                                          01888-1578
    (Address of principal executive offices)                       (Zip Code)
       Registrant's telephone number, including area code: (617) 622-1000
           Securities registered pursuant to Section 12(b) of the Act:

        Title of each class         Name of each exchange on which registered
    ----------------------------    -----------------------------------------
    Common Stock, $.05 par value             American Stock Exchange

           Securities registered pursuant to Section 12(g) of the Act:
                                      None

    Indicate by check mark whether the Registrant (1) has filed all reports
    required to be filed by Section 13 or 15(d) of the Securities Exchange
    Act of 1934 during the preceding 12 months, and (2) has been subject to
    the filing requirements for at least the past 90 days. Yes [ X ]  No [  ]
    Indicate by check mark if disclosure of delinquent filers pursuant to
    Item 405 of Regulation S-K is not contained herein, and will not be
    contained, to the best of the Registrant's knowledge, in definitive proxy
    or information statements incorporated by reference into Part III of this
    Form 10-K or any amendment to this Form 10-K. [  ]

    The aggregate market value of the voting stock held by nonaffiliates of
    the Registrant as of January 30, 1998, was approximately $14,630,000.

    As of January 30, 1998, the Registrant had 8,839,370 shares of Common
    Stock outstanding.
                       DOCUMENTS INCORPORATED BY REFERENCE

    Portions of the Registrant's Annual Report to Shareholders for the year
    ended January 3, 1998, are incorporated by reference into Parts I and II.

    Portions of the Registrant's definitive Proxy Statement for the Annual
    Meeting of Shareholders to be held on June 1, 1998, are incorporated by
    reference into Part III.
PAGE

                                     PART I

    Item 1. Business
            --------

    (a) General Development of Business
        -------------------------------

        Thermo Voltek Corp. (the Company or the Registrant) designs,
    manufactures, and markets test instruments and a range of products
    related to power amplification, conversion, and quality. The Company's
    test instruments simulate pulsed electromagnetic interference (pulsed
    EMI), radio frequency interference (RFI), and changes in AC voltage, to
    allow manufacturers of electronic systems and integrated circuits to test
    for electromagnetic compatibility (EMC), to ensure product quality and to
    meet certain regulatory requirements. The Company also provides EMC
    consulting and systems-integration services and distributes EMC-related
    products. The Company's power products include radio frequency (RF) and
    microwave power amplifiers, power-conversion equipment, and high-voltage
    and application-specific power supplies. These power products are used in
    communications, broadcast, research, and medical imaging applications. In
    July 1996, the Company acquired Pacific Power Source Corporation, a
    manufacturer of power-conversion equipment and programmable power
    amplifiers. In April 1997, the Company acquired Milmega Ltd., a
    manufacturer of microwave amplifiers. During 1997, the Company
    experienced lower demand for its EMC test products, due to the declining
    influence of IEC 801, the European Union directive on electromagnetic
    compatibility that took effect January 1, 1996, and, to a lesser extent,
    a decline in the component-reliability market for ESD test equipment that
    resulted from a slowdown in capital expenditures by the semiconductor
    industry. Due in part to these developments, during 1997 the Company
    implemented certain operational, organizational, and personnel changes.

        The Company was originally incorporated in 1960 under the name
    Universal Voltronics Corp. Thermedics Inc., a publicly traded subsidiary
    of Thermo Electron Corporation, acquired a controlling interest in the
    Company's common stock in March 1990. In November 1992, the Company's
    name was changed to Thermo Voltek Corp. As of January 3, 1998, Thermedics
    owned 5,771,208 shares of the Company's common stock, representing 65% of
    such stock outstanding. In addition to the Company's products, Thermedics
    develops, manufactures, and markets product quality-assurance systems,
    precision-weighing and inspection equipment, electrochemistry and
    microweighing products, security devices, and moisture-analysis systems,
    as well as implantable heart-assist systems, whole blood coagulation
    testing equipment, skin-incision devices, and other biomedical products.
    As of January 3, 1998, Thermo Electron owned 238,200 shares of the
    Company's common stock, representing 3% of such stock outstanding,
    including 186,500 shares that were purchased during 1997* in the open
    market for a total purchase price of $1,777,000. Thermo Electron provides
    analytical and monitoring instruments; biomedical products including
    heart-assist devices, respiratory-care equipment, and mammography
    systems; paper recycling and papermaking equipment; alternative-energy
    systems; industrial process equipment; and other specialized products.
    Thermo Electron also provides a range of services that include industrial

    * References to 1997, 1996, and 1995 herein are for the fiscal years
      ended January 3, 1998, December 28, 1996, and December 30, 1995,
      respectively.
                                        2PAGE

    outsourcing, particularly in environmental-liability management,
    laboratory analysis, and metallurgical processing; and conducts advanced-
    technology research and development.

        Thermedics intends, for the foreseeable future, to maintain at least
    50% ownership of the Company. This may require the purchase by Thermedics
    of additional shares (or convertible notes that are then converted) of
    the Company from time to time as the number of outstanding shares of the
    Company increases. These or any other purchases by Thermedics may be made
    either in the open market or directly from the Company or Thermo Electron
    or pursuant to conversions of the subordinated convertible notes issued
    by the Company to Thermedics. During 1997, Thermedics purchased 799,875
    shares of the Company's common stock in the open market for a total
    purchase price of $7,376,000. See Notes 4 and 8 to Consolidated Financial
    Statements in the Company's 1997 Annual Report to Shareholders for a
    description of outstanding stock options and convertible obligations
    issued by the Company.

    Forward-looking Statements

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Annual Report
    on Form 10-K. For this purpose, any statements contained herein that are
    not statements of historical fact may be deemed to be forward-looking
    statements. Without limiting the foregoing, the words "believes,"
    "anticipates," "plans," "expects," "seeks," "estimates," and similar
    expressions are intended to identify forward-looking statements. There
    are a number of important factors that could cause the results of the
    Company to differ materially from those indicated by such forward-looking
    statements, including those detailed under the heading "Forward-looking
    Statements" in the Registrant's 1997 Annual Report to Shareholders, which
    statements are incorporated herein by reference.

    (b) Financial Information About Industry Segments
        ---------------------------------------------

        The Company conducts business in one industry segment.

    (c) Description of Business
        -----------------------

        The Company designs, manufactures, and markets test instruments and a
    range of products related to power amplification, conversion, and
    quality. The Company's test instruments simulate pulsed electromagnetic
    interference (pulsed EMI), radio frequency interference (RFI), and
    changes in AC voltage, to allow manufacturers of electronic systems and
    integrated circuits to test for electromagnetic compatibility (EMC).
    These products are used in the product-development, design-verification,
    and quality-assurance stages, enabling customers to optimize performance,
    reliability, and safety in the final design, and to meet industry
    standards and regulatory requirements, including a European Union (EU)
    directive that took effect in January 1996. The Company's power products
    include radio frequency (RF) and microwave power amplifiers,
    power-conversion equipment, and high-voltage and application-specific
    power supplies. These power products are used in communications,
    broadcast, research, and medical imaging applications.

                                        3PAGE

        The Company's testing instruments fall into two main categories: (1)
    equipment to test completed electronic products, and (2) equipment to
    test individual electronic components such as integrated circuits.

        Product Testing Equipment. The Company's EMC testing systems for
    electronic products simulate pulsed EMI - including RFI, disturbances in
    electrical power, and natural and man-made phenomena such as lightning
    and static electricity - to allow manufacturers to check for resistance
    to these and other forms of potentially troublesome electronic pollution.
    These systems perform both immunity and emissions testing - to verify
    that completed electronic products are not only immune to EMI, but also
    that they are not emitting EMI. The Company's KeyTek Instrument
    division's ECAT(R) system integrates comprehensive pulsed EMI and
    power-quality failure simulation and testing with built-in diagnostic
    capabilities. KeyTek also offers a range of lower-cost instruments
    designed to test completed products for a particular type of pulsed EMI.
    KeyTek also manufactures the G-Strip, an RFI immunity tester that
    analyzes how effectively electronics resist the effects of radio
    frequency emitted by other electronic devices.

        Component-reliability Testing Equipment. KeyTek also manufactures EMC
    testing instruments that allow manufacturers to test electronic
    components and subassemblies, particularly integrated circuits and
    printed circuit boards, for immunity to electrostatic discharge (ESD)
    and electrical overstress (EOS). These products expose integrated
    circuits and printed circuit boards to controlled and repeatable stress
    levels, thereby determining their ability to withstand ESD and EOS.
    These products also simulate the damage that can occur during normal
    handling or operating procedures associated with the manufacturing,
    testing, and transportation of such components.

        The Company also provides EMC consulting and distribution services.
    Through its Comtest subsidiary, the Company distributes EMC-testing
    products for pulsed EMI and RFI immunity and emissions testing; provides
    a wide range of testing, consulting, training, and systems-integration
    services; and designs EMC test facilities. The Company also provides
    on-site management and service, and maintains testing and training
    facilities, at Comtest's Netherlands headquarters.

        The Company's power products, described below, have applications in
    both EMC and non-EMC areas. These include RF and microwave power
    amplifiers, power-conversion equipment, and high-voltage and
    application-specific power supplies.

        Power Amplifiers. Through its Kalmus Engineering and Milmega Ltd.
    divisions, the Company manufactures RF and microwave power amplifiers
    that have applications in EMC testing and other areas. When used in EMC
    test applications, the RF power amplifiers manufactured by Kalmus test
    products for immunity to conducted and radiated RFI. They are also
    suitable for a variety of laboratory and research applications where
    precise control over power level and frequency are required; in medical
    imaging applications; and in wireless communications applications,
    broadcasting, and mobile data communications. Milmega, acquired in April
    1997, designs and manufactures both RF and microwave power amplifiers.

                                        4PAGE

    Microwave power amplifiers have frequencies of one gigaHertz and above.
    Milmega's products are suitable for EMC test and other areas, including
    research, communications, medical, and military applications.

        Power-conversion Equipment. The Company's Pacific Power Source
    Corporation division manufactures programmable power amplifiers that can
    be incorporated into EMC test equipment to assess how well electronics
    tolerate normal variations in the quality and quantity of AC voltage.
    These amplifiers are also used in other kinds of testing equipment and in
    application-specific power supplies. In October 1997, the Company
    established a new division, Global Power Systems, to market specialized
    power products, particularly for use in marine applications. Its initial
    product line is a family of dock-to-yacht power systems that convert
    power from an onshore source anywhere in the world to the voltage, phase,
    and frequency required by luxury yachts.

        High-voltage Power Supplies. Through its Universal Voltronics
    division, the Company designs, manufactures, and markets high-voltage
    power supplies, modulators, and related high-voltage equipment for
    industrial, medical, and security processes, and defense and scientific
    research applications. These systems transform utility-supplied AC power
    into the DC voltages and currents required by the user and allow precise
    control over the performance level desired for each application.

    Raw Materials

        A number of the components of the Company's EMC-testing products are
    supplied by sole-source vendors. Although the Company has not experienced
    significant difficulty in obtaining adequate supplies from these vendors,
    and believes that it would be able to identify alternate suppliers if
    necessary, there can be no assurance that the unanticipated loss of a
    single vendor would not result in delays in shipments or in the
    introduction of new products.

    Backlog

        The Company's backlog of firm orders is measured by the amount of
    unshipped orders and, with respect to long-term contracts, the amount of
    the contract reduced by the revenue that has been recognized to date on a
    percentage-of-completion basis. Certain of these orders are cancellable
    by the customer upon payment of a cancellation charge. The Company's
    backlog was $10.2 million and $10.3 million as of January 3, 1998, and
    December 28, 1996, respectively. The Company believes that substantially
    all of the backlog at January 3, 1998, will be shipped or completed
    during the next 12 months.


                                        5PAGE

    Competition

        The Company is a leading supplier of EMC testing equipment. There are
    numerous companies worldwide that independently manufacture and market
    pulsed EMC test equipment for electronic products, and several more that
    independently manufacture and market component-reliability test
    equipment. The Company competes in this market primarily on the basis of
    performance, technical expertise, reputation, and price.

        In the market for RF power amplifiers and programmable power
    amplifiers, the Company competes with several companies worldwide based
    primarily on technical expertise, reputation, and price.

        In the market for high-voltage power supply systems of the general
    type manufactured and marketed by the Company, the Company competes with
    numerous companies for both contract and commercial sales primarily on
    the basis of technical expertise, product performance, reputation, and
    price.

        Substantially all of the Company's contract and commercial revenues
    are subject to intense competitive bidding. Some of the Company's
    competitors have substantially greater financial resources than those of
    the Company.

    Research and Development

        Research and development expenses for the Company were $3,620,000,
    $3,618,000, and $2,349,000 in 1997, 1996, and 1995, respectively.

    Environmental Protection Regulations

        The Company believes that compliance by the Company with federal,
    state, and local environmental protection regulations will not have a
    material adverse effect on its capital expenditures, earnings, or
    competitive position.

    Number of Employees

        As of January 3, 1998, the Company employed 278 people. Except for
    seven employees at Universal Voltronics, none of the Company's employees
    is represented by a union. The Company believes that relations with its
    employees are good.

    (d) Financial Information About Exports by Domestic Operations and
        --------------------------------------------------------------
        About Foreign Operations
        ------------------------

        Financial information about exports by domestic operations and about
    foreign operations is summarized in Note 11 to Consolidated Financial
    Statements in the Registrant's 1997 Annual Report to Shareholders, which
    information is incorporated herein by reference.


                                        6PAGE

    (e) Executive Officers of the Registrant
        ------------------------------------

                                       Present Title (Year First Became
        Name                      Age  Executive Officer)
        ------------------------  ---  --------------------------------
        John W. Wood Jr.          54   Chairman of the Board and Chief
                                         Executive Officer (1990)
        Colin I.W. Baxter         66   President and Chief Operating
                                         Officer (1997)
        John N. Hatsopoulos       63   Chief Financial Officer (1990)
        Paul F. Kelleher          55   Chief Accounting Officer (1990)

        Each executive officer serves until his successor is chosen or
    appointed by the Board of Directors and qualified or until his earlier
    resignation, death, or removal. Messrs. Wood, Hatsopoulos, and Kelleher
    have held comparable positions for at least five years either with the
    Company, Thermedics, or Thermo Electron. Mr. Baxter has been President
    and Chief Operating Officer of the Company since January 1997. Mr. Baxter
    has been President of the Company's Kalmus division since May 1995, and
    from July 1996 to January 1997 was President of the Company's Pacific
    Power division. Prior to joining the Company, Mr. Baxter was President
    and Chief Executive Officer of Dranetz Technologies, Inc., a designer and
    manufacturer of electronic instruments for measuring and monitoring
    electrical power quality, demand, and sequence of events recorders. Mr.
    Wood is a Senior Vice President of Thermo Electron and the Chairman of
    the Board of Thermedics but devotes such portion of his time to the
    affairs of the Company as the Company's needs reasonably require. Messrs.
    Hatsopoulos and Kelleher are full-time employees of Thermo Electron but
    devote such time to the affairs of the Company as the Company's needs
    reasonably require.

    Item 2. Properties
            ----------

        The Company owns approximately 45,000 square feet of office,
    engineering, laboratory, and production space in Mount Kisco, New York,
    and leases approximately 110,000 square feet of office, engineering,
    laboratory, and production space under leases expiring from 1998 to 2010,
    principally in Massachusetts, Washington, California, The Netherlands,
    the United Kingdom, and Italy. The Company believes that these facilities
    are in good condition and are suitable and adequate for its present
    operations, and that suitable space is readily available if any of such
    leases are not extended.

    Item 3. Legal Proceedings
            -----------------

        Not applicable.


    Item 4. Submission of Matters to a Vote of Security Holders
            ---------------------------------------------------

        Not applicable.

                                        7PAGE

                                     PART II

    Item 5. Market for Registrant's Common Equity and Related Stockholder
            -------------------------------------------------------------
            Matters
            -------

        Information concerning the market and market price for the
    Registrant's common stock, $.05 par value, and dividend policy is
    included under the sections labeled "Common Stock Market Information" and
    "Dividend Policy" in the Registrant's 1997 Annual Report to Shareholders
    and is incorporated herein by reference.

    Item 6. Selected Financial Data
            -----------------------

        The information required under this item is included under the
    sections labeled "Selected Financial Information" and "Dividend Policy"
    in the Registrant's 1997 Annual Report to Shareholders and is
    incorporated herein by reference.

    Item 7. Management's Discussion and Analysis of Financial Condition and
            ---------------------------------------------------------------
            Results of Operations
            ---------------------

        The information required under this item is included under the
    heading "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" in the Registrant's 1997 Annual Report to
    Shareholders and is incorporated herein by reference.

    Item 8. Financial Statements and Supplementary Data
            -------------------------------------------

        The Registrant's Consolidated Financial Statements as of January 3,
    1998, and Supplementary Data are included in the Registrant's 1997 Annual
    Report to Shareholders and are incorporated herein by reference.

    Item 9. Changes in and Disagreements with Accountants on Accounting and
            ---------------------------------------------------------------
            Financial Disclosure
            --------------------

        Not applicable.




                                        8PAGE

                                    PART III

    Item 10. Directors and Executive Officers of the Registrant
             --------------------------------------------------

        The information concerning directors required under this item is
    incorporated herein by reference from the material contained under the
    caption "Election of Directors" in the Registrant's definitive proxy
    statement to be filed with the Securities and Exchange Commission
    pursuant to Regulation 14A, not later than 120 days after the close of
    the fiscal year. The information concerning delinquent filers pursuant to
    Item 405 of Regulation S-K is incorporated herein by reference from the
    material contained under the caption "Section 16(a) Beneficial Ownership
    Reporting Compliance" under the caption "Stock Ownership" in the
    Registrant's definitive proxy statement to be filed with the Securities
    and Exchange Commission pursuant to Regulation 14A, not later than 120
    days after the close of the fiscal year.

    Item 11. Executive Compensation
             ----------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Executive
    Compensation" in the Registrant's definitive proxy statement to be filed
    with the Securities and Exchange Commission pursuant to Regulation 14A,
    not later than 120 days after the close of the fiscal year.

    Item 12. Security Ownership of Certain Beneficial Owners and Management
             --------------------------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Stock Ownership"
    in the Registrant's definitive proxy statement to be filed with the
    Securities and Exchange Commission pursuant to Regulation 14A, not later
    than 120 days after the close of the fiscal year.

    Item 13. Certain Relationships and Related Transactions
             ----------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Relationship
    with Affiliates" in the Registrant's definitive proxy statement to be
    filed with the Securities and Exchange Commission pursuant to Regulation
    14A, not later than 120 days after the close of the fiscal year.





                                        9PAGE

                                     PART IV

    Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K
             ----------------------------------------------------------------

       (a,d) Financial Statements and Schedules
             ----------------------------------

             (1) The consolidated financial statements set forth in the list
                 below are filed as part of this Report.

             (2) The consolidated financial statement schedule set forth in
                 the list below is filed as part of this Report.

             (3) Exhibits filed herewith or incorporated herein by reference
                 are set forth in Item 14(c) below.

             List of Financial Statements and Schedules Referenced in this
             -------------------------------------------------------------
             Item 14
             -------

             Information incorporated by reference from Exhibit 13 filed
             herewith:

                 Consolidated Statement of Income
                 Consolidated Balance Sheet
                 Consolidated Statement of Cash Flows
                 Consolidated Statement of Shareholders' Investment
                 Notes to Consolidated Financial Statements
                 Report of Independent Public Accountants

             Financial Statement Schedules filed herewith:

                 Schedule II: Valuation and Qualifying Accounts

             All other schedules are omitted because they are not applicable
             or not required, or because the required information is shown
             either in the financial statements or in the notes thereto.

         (b)Reports on Form 8-K
            -------------------

            None.

         (c)Exhibits
            --------

            See Exhibit Index on the page immediately preceding exhibits.




                                       10PAGE

                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
    Exchange Act of 1934, the Registrant has duly caused this report to be
    signed on its behalf by the undersigned, thereunto duly authorized.

    Date: March 16, 1998               THERMO VOLTEK CORP.



                                       By: John W. Wood Jr.
                                           -----------------------
                                           John W. Wood Jr.
                                           Chief Executive Officer

        Pursuant to the requirements of the Securities Exchange Act of 1934,
    this report has been signed below by the following persons on behalf of
    the Registrant and in the capacities indicated below, as of March 16,
    1998.

    Signature                          Title
    ---------                          -----


    By: John W. Wood Jr.           Chairman of the Board, Chief Executive
        -------------------------       Officer, and Director
        John W. Wood Jr.         

    By: John N. Hatsopoulos        Chief Financial Officer and Senior
        -------------------------       Vice President
        John N. Hatsopoulos       

    By: Paul F. Kelleher           Chief Accounting Officer
        -------------------------
        Paul F. Kelleher

    By  Elias P. Gyftopoulos       Director
        -------------------------
        Elias P. Gyftopoulos

    By: William W. Hoover          Director
        -------------------------
        William W. Hoover

    By: Sandra L. Lambert          Director
        -------------------------
        Sandra L. Lambert

    By: Theo Melas-Kyriazi         Director
        -------------------------
        Theo Melas-Kyriazi

    By: Peter Richman              Director
        -------------------------
        Peter Richman

                                       11PAGE

                    Report of Independent Public Accountants

    To the Shareholders and Board of Directors of Thermo Voltek Corp.:

        We have audited, in accordance with generally accepted auditing
    standards, the consolidated financial statements included in Thermo
    Voltek Corp.'s Annual Report to Shareholders incorporated by reference in
    this Form 10-K, and have issued our report thereon dated February 12,
    1998. Our audits were made for the purpose of forming an opinion on those
    statements taken as a whole. The schedule listed in Item 14 on page 10 is
    the responsibility of the Company's management and is presented for
    purposes of complying with the Securities and Exchange Commission's rules
    and is not part of the basic consolidated financial statements. This
    schedule has been subjected to the auditing procedures applied in the
    audits of the basic consolidated financial statements and, in our
    opinion, fairly states in all material respects the consolidated
    financial data required to be set forth therein in relation to the basic
    consolidated financial statements taken as a whole.



                                            Arthur Andersen LLP



    Boston, Massachusetts
    February 12, 1998










                                       12PAGE

   SCHEDULE II

                               THERMO VOLTEK CORP.
                        Valuation and Qualifying Accounts
                                 (In thousands)


                         Balance  Provision
                              at    Charged   Accounts                Balance
                       Beginning         to    Written                 at End
   Description           of Year    Expense        Off      Other (a) of Year
   ---------------------------------------------------------------------------
   Allowance for
     Doubtful Accounts

   Year Ended
     January 3, 1998        $587       $326      $(90)       $(24)       $799

   Year Ended
     December 28, 1996      $446       $103      $(11)       $ 49        $587

   Year Ended
     December 30, 1995      $343       $135      $(51)       $ 19        $446

   (a)Allowances of businesses acquired during the year as described in Note
      3 to Consolidated Financial Statements in the Registrant's 1997 Annual
      Report to Shareholders and the effect of foreign currency translation.





                                       13PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ------------------------------------------------------------------------
      2.1        Asset Purchase Agreement dated March 1, 1995, among KeyTek
                 Instrument Division of Thermo Voltek Corp., Kalmus
                 Engineering Incorporated, RF Power Labs, Incorporated, and
                 Frank Kalmus (filed as Exhibit 2.4 to the Registrant's
                 Annual Report on Form 10-K for the year ended December 31,
                 1994 [File No. 1-10574] and incorporated herein by
                 reference). Pursuant to Item 601(b)(2) of Regulation S-K,
                 schedules to this Agreement have been omitted. The Company
                 hereby undertakes to furnish supplementally a copy of such
                 schedules to the Commission upon request.

      2.2        Asset Purchase Agreement dated as of July 3, 1996,
                 between the Registrant and Pacific Power Source
                 Corporation (filed as Exhibit 2.1 to the Registrant's
                 Quarterly Report on Form 10-Q for the quarter ended
                 June 29, 1996 [File No. 1-10574] and incorporated
                 herein by reference). Pursuant to Item 601(b)(2) of
                 Regulation S-K, schedules to this Agreement have been
                 omitted. The Company hereby undertakes to furnish
                 supplementally a copy of such schedules to the
                 Commission upon request.

      3.1        Restated Certificate of Incorporation of the
                 Registrant, as amended (filed as Exhibit 3.1 to the
                 Registrant's Annual Report on Form 10-K for the year
                 ended January 2, 1993 [File No. 1-10574] and
                 incorporated herein by reference).

      3.2        Composite Restatement of By-Laws, as amended (filed as
                 Exhibit 3.2 to the Registrant's Transition Report on
                 Form 10-K for the six months ended December 29, 1990
                 [File No. 1-10574] and incorporated herein by
                 reference).

      4.1        Agreement between the Registrant and Thermedics dated
                 June 5, 1992, for Purchase of Note (filed as Exhibit 4
                 to the Registrant's Current Report on Form 8-K dated
                 June 5, 1992 [File No. 1-10574] and incorporated
                 herein by reference).

      4.2        Fiscal Agency Agreement dated as of November 19, 1993,
                 among the Registrant, Thermo Electron, and Chemical
                 Bank (filed as Exhibit 4.3 to the Registrant's Annual
                 Report on Form 10-K for the fiscal year ended January
                 1, 1994 [File No. 1-10574] and incorporated herein by
                 reference).


                                       14PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
      4.3         Guarantee Reimbursement Agreement dated February 7, 1994,
                  among the Registrant, Thermedics, Thermo Cardiosystems
                  Inc., and Thermo Electron (filed as Exhibit 4.4 to
                  Thermedics' Annual Report on Form 10-K for the fiscal year
                  ended January 1, 1994 [File No. 1-9567] and incorporated
                  herein by reference).

     10.1         Amended and Restated Corporate Services Agreement dated
                  January 3, 1993, between Thermo Electron and the Registrant
                  (filed as Exhibit 10.3 to the Registrant's Annual Report on
                  Form 10-K for the year ended January 2, 1993 [File No.
                  1-10574] and incorporated herein by reference).

     10.2         Form of Indemnification Agreement for Directors and
                  Officers of the Registrant (filed as Exhibit 10.13 to the
                  Registrant's Transition Report on Form 10-K for the six
                  months ended December 29, 1990 [File No. 1-10574] and
                  incorporated herein by reference).

     10.3         Thermo Electron Corporate Charter as amended and restated
                  effective January 3, 1993 (filed as Exhibit 10.5 to the
                  Registrant's Annual Report on Form 10-K for the year ended
                  January 2, 1993 [File No. 1-10574] and incorporated herein
                  by reference).

     10.4         Consulting Agreement between the Registrant and Peter
                  Richman, as of August 5, 1993 (filed as Exhibit 10.25 to
                  the Registrant's Quarterly Report on Form 10-Q for the
                  quarter ended July 3, 1993 [File No. 1-10574] and
                  incorporated herein by reference).

     10.5         Lease Agreement dated August 2, 1993, between Comtest
                  Invest B.V. and Comtest Instrumentation B.V. (filed as
                  Exhibit 10.6 to the Registrant's Annual Report on Form 10-K
                  for the fiscal year ended January 1, 1994 [File No.
                  1-10574] and incorporated herein by reference).

     10.6         Note dated July 2, 1993, from the Registrant to Thermo
                  Electron Corporation (filed as Exhibit 10.7 to the
                  Registrant's Annual Report on Form 10-K for the fiscal year
                  ended January 1, 1994 [File No. 1-10574] and incorporated
                  herein by reference).

     10.7         Amended and Restated Master Repurchase Agreement dated as
                  of July 2, 1996, between the Registrant and Thermo Electron
                  (filed as Exhibit 10.7 to the Registrant's Annual Report on
                  Form 10-K for the fiscal year ended December 28, 1996 [File
                  No. 1-10574] and incorporated herein by reference).

    10.8 - 10.18  Reserved.

                                       15PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
    10.19         1985 Stock Option Plan of the Registrant (filed as Exhibit
                  10.14 to the Registrant's Annual Report on Form 10-K for
                  the fiscal year ended June 30, 1985 [File No. 0-8245] and
                  incorporated herein by reference). (Maximum number of
                  shares issuable is 300,000 shares, after adjustment to
                  reflect 1-for-3 reverse stock split effected in November
                  1992 and 3-for-2 stock splits effected in November 1993 and
                  August 1996.)

    10.20         1990 Stock Option Plan, as amended, of the Registrant
                  (filed as Exhibit 10.2 to the Registrant's Quarterly Report
                  on Form 10-Q for the quarter ended July 2, 1994 [File No.
                  1-10574] and incorporated herein by reference). (Maximum
                  number of shares issuable is 600,000 shares, after
                  adjustment to reflect share increases in 1993 and 1994,
                  1-for-3 reverse stock split effected in November 1992, and
                  3-for-2 stock splits effected in November 1993 and August
                  1996.)

    10.21         Equity Incentive Plan of the Registrant (filed as Exhibit
                  10.21 to the Registrant's Annual Report on Form 10-K for
                  the year ended December 31, 1994 [File No. 1-10574] and
                  incorporated herein by reference).

                  In addition to the stock-based compensation plans of the
                  Registrant, the executive officers of the Registrant may be
                  granted awards under stock-based compensation plans of
                  Thermo Electron and Thermedics for services rendered to the
                  Registrant or such affiliated corporations. The terms of
                  such plans are substantially the same as those of the
                  Registrant's Equity Incentive Plan.

    10.22         Deferred Compensation Plan for Directors of the Registrant
                  (filed as Exhibit 10.23 to the Registrant's Quarterly
                  Report on Form 10-Q for the quarter ended July 3, 1993
                  [File No. 1-10574] and incorporated herein by reference).

    10.23         Directors' Stock Option Plan of the Registrant (filed as
                  Exhibit 10.23 to the Registrant's Annual Report on Form
                  10-K for the year ended December 31, 1994 [File No.
                  1-10574] and incorporated herein by reference). 



                                       16PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
     10.24        Restated Stock Holdings Assistance Plan and Form of
                  Promissory Note.

      10.25       Amended and Restated Master Guarantee Reimbursement and
                  Loan Agreement dated December 18, 1997, between the Company
                  and Thermo Electron.

      10.26       Amended and Restated Master Guarantee Reimbursement and
                  Loan Agreement dated December 18, 1997, between the Company
                  and Thermedics.

     13           Annual Report to Shareholders for the year ended January 3,
                  1998 (only those portions incorporated herein by
                  reference).

     21           Subsidiaries of the Registrant.

     23           Consent of Arthur Andersen LLP.

     27.1         Financial Data Schedule for the year ended January 3, 1998.

     27.2         Financial Data Schedule for the quarter ended March 30,
                   1996 (restated for the adoption of SFAS No. 128).