1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             --------------------
   
                                AMENDMENT NO. 1

                                       TO
    
                                 SCHEDULE 13E-3

                        RULE 13E-3 TRANSACTION STATEMENT
       (PURSUANT TO SECTION 13(e) OF THE SECURITIES EXCHANGE ACT OF 1934)

                               Thermo Voltek Corp.
                                (Name of Issuer)

                               Thermo Voltek Corp.
                                 Thermedics Inc.
                           TV Acquisition Corporation
                           Thermo Electron Corporation
                      (Name of Person(s) Filing Statement)

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

                                 883602 10 4
                      (CUSIP Number of Class of Securities)

                          Sandra L. Lambert, Secretary
                               Thermo Voltek Corp.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                  P.O. Box 9046
                        Waltham, Massachusetts 02454-9046
                                 (781) 622-1000
 (Name, Address and Telephone Number of Person Authorized to Receive Notices
         and Communications on Behalf of Person(s) Filing Statement)

                                 with a copy to:
                       Seth H. Hoogasian, General Counsel
                               Thermo Voltek Corp.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                  P.O. Box 9046
                        Waltham, Massachusetts 02454-9046
                                 (781) 622-1000

This statement is filed in connection with (check the appropriate box):

a. /X/ The filing of solicitation materials or an information statement subject
       to Regulation 14A, Regulation 14C, or Rule 13e-3(c) under the Securities
       Exchange Act of 1934.

b.     The filing of a registration statement under the Securities Act of 1933.

c.     A tender offer.

d.     None of the above.
   2
Check the following box if the soliciting materials or information statement
referred to in checking box (a) are preliminary copies.    /X/

                            Calculation of Filing Fee



           Transaction Value*                     Amount of Filing Fee
           ------------------                     --------------------
                                               
              $18,744,950                               $3,749


* Solely for purposes of calculating the filing fee.  Assumes purchase of
2,677,850 shares of Common Stock, par value $.05 per share, of Thermo Voltek
Corp. at $7.00 per share.

/X/      Check box if any part of the fee is offset as provided by Rule
         0-11(a)(2) and identify the filing with which the offsetting fee was
         previously paid. Identify the previous filing by registration statement
         number, or the form or schedule and the date of its filing.
   
Amount previously paid:       $3,749    
Form or registration no.:     Preliminary Proxy Statement on Schedule 14A
Filing party:                 Thermo Voltek Corp.
Date filed:                   December 3, 1998, January 19, 1999
    



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         This Amendment No. 1 to Rule 13e-3 Transaction Statement (as so
amended, the "Statement") is being filed in connection with the filing by Thermo
Voltek Corp. ("Voltek" or the "Company") with the Securities and Exchange
Commission (the "Commission") on January 19, 1999 of a revised Preliminary Proxy
Statement on Schedule 14A (as amended, the "Proxy Statement") in connection with
a special meeting of the stockholders of Voltek. At such meeting, the
stockholders of Voltek will vote upon the adoption of an Agreement and Plan of
Merger dated as of November 24, 1998 (the "Merger Agreement") by and among
Voltek, TV Acquisition Corporation (the "Merger Sub") and Thermedics Inc.
("Thermedics"), pursuant to which the Merger Sub, a wholly owned subsidiary of
Thermedics, will be merged with and into Voltek.
    
         The following cross reference sheet is being supplied pursuant to
General Instruction F to Schedule 13E-3 and shows the location in the Proxy
Statement of the information required to be included in response to the items of
this Statement. The information in the Schedule 14A which is attached hereto as
Exhibit (d)(3), including all appendices thereto, is hereby expressly
incorporated herein by reference and the responses to each item are qualified in
their entirety by the provisions of the Proxy Statement.

                              CROSS REFERENCE SHEET

Item in Schedule 13E-3              Caption or Location in the Proxy Statement
- ----------------------              ------------------------------------------

Item 1(a)..........................."Introduction"; "Summary - Parties to the
                                    Merger"

Item 1(b)..........................."Summary - Purpose of the Special Meeting";
                                    "- Record Date and Quorum"; "- Market Prices
                                    of Common Stock and Dividends"; "The Special
                                    Meeting - Record Date and Quorum
                                    Requirement"

Item 1(c)..........................."Summary - Market Prices of Common Stock and
                                    Dividends"

Item 1(d)..........................."Summary - Market Prices of Common Stock
                                    and Dividends"

Item 1(e)...........................Not applicable

Item 1(f)..........................."Appendix E - Information Concerning
                                    Transactions in the Common Stock of the
                                    Company"

Item 2(a) - (c)....................."Summary - Parties to the Merger"; "Business
                                    of the Company"; "Certain Information
                                    Concerning the Merger Sub, Thermedics and
                                    Thermo Electron"; "Appendix D - Information
                                    Concerning Directors and Executive Officers
                                    of the Company, Thermedics, the Merger Sub 
                                    and Thermo Electron"


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   4
Item 2(d)..........................."Appendix D - Information Concerning
                                    Directors and Executive Officers of the
                                    Company, Thermedics, the Merger Sub and
                                    Thermo Electron"

Item 2(e) ..........................Not Applicable

Item 2(f)...........................Not Applicable

Item 2(g)..........................."Appendix D - Information Concerning
                                    Directors and Executive Officers of the
                                    Company, Thermedics, the Merger Sub and
                                    Thermo Electron"

Item 3(a)(1)........................"Certain Transactions"

Item 3(a)(2) - 3(b) ................"Summary - The Merger"; "- Purpose and
                                    Reasons of Thermedics and Thermo Electron
                                    for the Merger"; "Special Factors -
                                    Background of the Merger"; "- The Special
                                    Committee's and the Board's Recommendation";
                                    "- Purpose and Reasons of Thermedics and
                                    Thermo Electron for the Merger"; "Certain
                                    Transactions"; "Appendix E - Information
                                    Concerning Transactions in the Common Stock
                                    of the Company"

Item 4(a)..........................."Introduction"; "Summary - The Merger"; 
                                    "- Assumption of Voltek Stock Options by 
                                    Thermedics"; "- Certain Effects of the 
                                    Merger"; "- Conditions to the Merger, 
                                    Termination and Expenses"; "Special 
                                    Factors - Certain Effects of the Merger"; 
                                    "The Merger"; "Appendix A - Agreement and
                                    Plan of Merger"

Item 4(b)..........................."Introduction"; "Summary - Purpose of the
                                    Special Meeting"; "- The Merger"; "Special
                                    Factors - Conduct of Voltek's Business 
                                    After the Merger"; "The Merger - Conversion
                                    of Securities"; "Federal Income Tax 
                                    Consequences"; "Appendix A - Agreement and
                                    Plan of Merger"

Item 5(a)..........................."Special Factors - Conduct of Voltek's
                                    Business After the Merger"

Item 5(b) .........................."Special Factors - Conduct of Voltek's
                                    Business After the Merger"

Item 5(c)..........................."Introduction"; "Special Factors - Conflicts
                                    of Interest"; "- Conduct of Voltek's
                                    Business After the Merger"


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   5
Item 5(d) .........................."Summary - Certain Effects of the Merger";
                                    "Special Factors - Certain Effects of the
                                    Merger"

Item 5(e)..........................."Summary - Certain Effects of the Merger";
                                    "Special Factors - Certain Effects of the
                                    Merger"; "- Conduct of Voltek's Business
                                    After the Merger"

Item 5(f) .........................."Summary - Certain Effects of the Merger";
                                    "Special Factors - Certain Effects of the
                                    Merger"

Item 5(g) .........................."Summary - Certain Effects of the Merger";
                                    "Special Factors - Certain Effects of the
                                    Merger"

Item 6(a)..........................."The Merger - Source of Funds"

Item 6(b)..........................."Summary - Opinion of Financial Advisor"; 
                                    "- Conflicts of Interest"; "Special 
                                    Factors - Opinion of Financial Advisor"; 
                                    "- Conflicts of Interest"; "The Merger
                                     - Expenses"
Item 6(c)...........................Not applicable

Item 6(d)...........................Not applicable

Item 7(a) - (c)....................."Summary - Purpose of the Special Meeting";
                                    "- Opinion of Financial Advisor";
                                    "- Purpose and Reasons of Thermedics and
                                    Thermo Electron for the Merger"; "Special
                                    Factors - Background of the Merger"; 
                                    "- The Special Committee's and the Board's
                                    Recommendation"; "- Opinion of Financial
                                    Advisor"; "- Purpose and Reasons of
                                    Thermedics and Thermo Electron for the
                                    Merger"

Item 7(d) .........................."Summary - The Merger"; "- Assumption of
                                    Voltek Stock Options by Thermedics";
                                    "- Conflicts of Interest"; 
                                    "- Certain Effects of the Merger"; 
                                    "- Federal Income Tax Consequences";
                                    "Special Factors - Conflicts of Interest";
                                    "- Certain Effects of the Merger"; 
                                    "- Conduct of Voltek's Business After the
                                    Merger"; "The Merger - Conversion of
                                    Securities"; "- Assumption of Voltek Stock
                                    Options by Thermedics"; "Federal Income Tax
                                    Consequences"

Item 8(a) .........................."Summary - The Special Committee's and the
                                    Board's Recommendation"; "- Position of 
                                    Thermedics and Thermo Electron as to 
                                    Fairness of the Merger"; "Special Factors - 
                                    The Special Committee's and the Board's 
                                    Recommendation"; "- Position of 



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                                    Thermedics and Thermo Electron as to 
                                    Fairness of the Merger"

Item 8(b) .........................."Summary - The Special Committee's and the
                                    Board's Recommendation"; "- Position of 
                                    Thermedics and Thermo Electron as to 
                                    Fairness of the Merger"; "Special Factors - 
                                    Background of the Merger"; "- The Special 
                                    Committee's and the Board's Recommendation";
                                    "- Opinion of Financial Advisor";  
                                    "- Position of Thermedics and Thermo  
                                     Electron as to Fairness of the Merger"

Item 8(c) .........................."Introduction"; "Summary - Vote Required
                                    and Revocation of Proxies"; "The Special
                                    Meeting - Voting Procedures"; "The Merger
                                    - Conditions"

Item 8(d)..........................."Summary - The Special Committee's and the
                                    Board's Recommendation"; "- Opinion of
                                    Financial Advisor"; "Special Factors -
                                    Background of the Merger"; "- The Special
                                    Committee's and the Board's Recommendation";
                                    "- Opinion of Financial Advisor"; "Appendix 
                                    B - Fairness Opinion of HSBC Securities, 
                                    Inc."

Item 8(e)..........................."Summary - The Special Committee's and the
                                    Board's Recommendation"; "Special Factors
                                    - The Special Committee's and the Board's
                                    Recommendation"

Item 8(f)...........................None

Item 9(a) - (c)....................."Summary - Opinion of Financial Advisor";
                                    "Special Factors - Background of the
                                    Merger"; "- Opinion of Financial Advisor";
                                    "Appendix B - Fairness Opinion of HSBC
                                    Securities, Inc."

Item 10(a) ........................."Introduction"; "Summary - Vote Required and
                                    Revocation of Proxies"; "- Conflicts of
                                    Interest"; "Special Factors - Purpose and
                                    Reasons of Thermedics and Thermo Electron
                                    for the Merger"; "- Conflicts of Interest";
                                    "The Special Meeting - Voting Procedures";
                                    "Security Ownership of Certain Beneficial
                                    Owners and Management"; "Appendix E -
                                    Information Concerning Transactions in the
                                    Common Stock of the Company"


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   7
Item 10(b).........................."Appendix E - Information Concerning
                                    Transactions in the Common Stock of the
                                    Company"

Item 11............................."Introduction"; "Summary - Vote Required
                                    and Revocation of Proxies"; "-  The
                                    Merger"; "The Special Meeting - Voting
                                    Procedures"; "The Merger"; "Appendix A -
                                    Agreement and Plan of Merger"

Item 12(a).........................."Introduction"; "Summary - Vote Required
                                    and Revocation of Proxies"; "The Special
                                    Meeting - Voting Procedures"; "Appendix D -
                                    Information Concerning Directors and
                                    Executive Officers of the Company,
                                    Thermedics, the Merger Sub and Thermo
                                    Electron"

Item 12(b).........................."Summary - The Special Committee's and the
                                    Board's Recommendation"; "- Position of
                                    Thermedics and Thermo Electron as to
                                    Fairness of the Merger"; "Special Factors -
                                    The Special Committee's and the Board's
                                    Recommendation"; "- Position of Thermedics
                                    and Thermo Electron as to Fairness of the
                                    Merger"

Item 13(a).........................."Summary - Rights of Dissenting
                                    Stockholders"; "The Special Meeting - Voting
                                    Procedures"; "Rights of Dissenting
                                    Stockholders"; "Appendix C - Section 262 of
                                    the General Corporation Law of the State of
                                    Delaware"

Item 13(b)..........................Not applicable

Item 13(c).........................."Special Factors -- Certain Effects of the 
                                     Merger"


Item 14(a).........................."Selected Quarterly Financial Data"; "Ratio
                                    of Earnings to Fixed Charges"; "Selected
                                    Financial Information"; "Consolidated
                                    Financial Statements"

Item 14(b)..........................Not applicable

Item 15(a).........................."The Special Meeting - Proxy Solicitation"

Item 15(b)..........................Not applicable

Item 16.............................Entirety of Proxy Statement

Item 17(a)..........................Not applicable

Item 17(b)..........................Opinion of HSBC Securities, Inc. dated
                                    November 24, 1998 (included as Appendix B
                                    to the Proxy Statement)

Item 17(c) .........................Agreement and Plan of Merger dated as of
                                    November 24, 1998 among Thermo Voltek Corp.,
                                    Thermedics Inc., and TV Acquisition
                                    Corporation (included as Appendix A to the
                                    Proxy Statement)


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Item 17(d)(1) ......................Preliminary Copy of Letter to Stockholders

Item 17(d)(2) ......................Preliminary Copy of Notice of Special
                                    Meeting of Stockholders

Item 17(d)(3) ......................Preliminary Proxy Statement

Item 17(d)(4) ......................Form of Proxy

Item 17(e) .........................Text of Section 262 of the General
                                    Corporation Law of the State of Delaware
                                    (included as Appendix C to the Preliminary
                                    Proxy Statement)

Item 17(f) .........................Preliminary Proxy Statement

ITEM 1. ISSUER AND CLASS OF SECURITY SUBJECT TO THE TRANSACTION.

      (a) The information set forth in the sections entitled "Introduction"
and "Summary - Parties to the Merger" of the Proxy Statement is incorporated
herein by reference.

      (b) The information set forth in the sections entitled "Summary - Purpose
of the Special Meeting," "- Record Date and Quorum," "- Market Prices of Common
Stock and Dividends," and "The Special Meeting - Record Date and Quorum
Requirement" of the Proxy Statement is incorporated herein by reference.

      (c) The information set forth in the section entitled "Summary - Market
Prices of Common Stock and Dividends" of the Proxy Statement is incorporated
herein by reference.

      (d) The information set forth in the section entitled "Summary - Market
Prices of Common Stock and Dividends" of the Proxy Statement is incorporated
herein by reference.

      (e) Not applicable.

      (f) The information set forth in Appendix E to the Proxy Statement is
incorporated herein by reference.

ITEM 2. IDENTITY AND BACKGROUND.

      This statement is being filed jointly by the Company (which is the issuer
of the class of equity securities that is the subject of the Rule 13e-3
transaction), Thermedics, the Merger Sub, and Thermo Electron.

      (a) - (c) The information set forth in the sections entitled "Summary
Parties to the Merger", "Business of the Company," "Certain Information
Concerning the Merger Sub, Thermedics and Thermo Electron," and Appendix D to 
the Proxy Statement is incorporated herein by reference.


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      (d) The information set forth in Appendix D to the Proxy Statement is
incorporated herein by reference.

      (e) During the last five years, none of the Company, Thermedics, the
Merger Sub or Thermo Electron, nor (to the knowledge of each of the Company, 
Thermedics, the Merger Sub or Thermo Electron, respectively) any executive 
officer or director of the Company, Thermedics, the Merger Sub or Thermo 
Electron, respectively, has been convicted in a criminal proceeding (excluding 
traffic violations and similar misdemeanors).

      (f) During the last five years, none of the Company, Thermedics, the
Merger Sub or Thermo Electron, nor (to the knowledge of each of the Company, 
Thermedics, the Merger Sub or Thermo Electron, respectively) any executive 
officer or director of the Company, Thermedics, the Merger Sub or Thermo 
Electron, respectively, has been a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction which resulted in a judgment,
decree or final order (i) enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or (ii)
finding a violation with respect to such laws.

      (g) The information set forth in Appendix D to the Proxy Statement is
incorporated herein by reference.

ITEM 3. PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS.

      (a) (1) The information set forth in the section entitled "Certain
Transactions" of the Proxy Statement is incorporated herein by reference.

      (a) (2)-(b) The information set forth in the sections entitled "Summary -
The Merger," "- Purpose and Reasons of Thermedics and Thermo Electron for the
Merger," "Special Factors - Background of the Merger," "The Special Committee's
and the Board's Recommendation," "- Purpose and Reasons of Thermedics and Thermo
Electron for the Merger," "Certain Transactions" and in Appendix E to the Proxy
Statement is incorporated herein by reference.

ITEM 4. TERMS OF THE TRANSACTION.

      (a) The information set forth in the sections entitled "Introduction,"
"Summary - The Merger," "- Assumption of Voltek Stock Options by Thermedics,"
"- Certain Effects of the Merger, " "- Conditions to the Merger, Termination and
Expenses," "Special Factors - Certain Effects of the Merger," and "The Merger"
and in Appendix A to the Proxy Statement is incorporated herein by reference.

      (b) The information set forth in the sections entitled "Introduction,"
"Summary - Purpose of the Special Meeting," "- The Merger," "Special Factors -
Conduct of Voltek's Business After the Merger," "The Merger - Conversion of
Securities," "Federal Income Tax Consequences," and Appendix A to the Proxy
Statement is incorporated herein by reference.

ITEM 5. PLANS OR PROPOSALS OF THE ISSUER OR AFFILIATE.

      (a) The information set forth in the section entitled "Special Factors -
Conduct of Voltek's Business After the Merger" of the Proxy Statement is
incorporated herein by reference.


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      (b) The information set forth in the section entitled "Special Factors -
Conduct of Voltek's Business After the Merger" of the Proxy Statement is
incorporated herein by reference.

      (c) The information set forth in the sections entitled "Introduction,"
"Special Factors - Conflicts of Interest," and "- Conduct of Voltek's Business
After the Merger" of the Proxy Statement is incorporated herein by
reference.

      (d) The information set forth in the sections entitled "Summary - Certain
Effects of the Merger" and "Special Factors - Certain Effects of the Merger" of
the Proxy Statement is incorporated herein by reference.

      (e) The information set forth in the sections entitled "Summary - Certain
Effects of the Merger," "Special Factors - Certain Effects of the Merger" and 
"- Conduct of Voltek's Business After the Merger" of the Proxy Statement is
incorporated herein by reference.

      (f) The information set forth in the sections entitled "Summary - Certain
Effects of the Merger" and "Special Factors - Certain Effects of the Merger" of
the Proxy Statement is incorporated herein by reference.

      (g) The information set forth in the sections entitled "Summary - Certain
Effects of the Merger" and "Special Factors - Certain Effects of the Merger" of
the Proxy Statement is incorporated herein by reference.

ITEM 6. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

      (a) The information set forth in the section entitled "The Merger - Source
of Funds" of the Proxy Statement is incorporated herein by reference.

      (b) The information set forth in the sections entitled "Summary - Opinion
of Financial Advisor"; "- Conflicts of Interest"; "Special Factors - Opinion of
Financial Advisor," "- Conflicts of Interest," and "The Merger - Expenses" of
the Proxy Statement is incorporated herein by reference.

      (c) Not applicable.

      (d) Not applicable.

ITEM 7. PURPOSE(S), ALTERNATIVES, REASONS AND EFFECTS.

      (a) - (c) The information set forth in the sections entitled "Summary -
Purpose of the Special Meeting," "- Opinion of Financial Advisor," "- Purpose
and Reasons of Thermedics and Thermo Electron for the Merger," "Special
Factors - Background of the Merger," "- The Special Committee's and the Board's
Recommendation," "- Opinion of Financial Advisor," and "- Purpose and Reasons
of Thermedics and Thermo Electron for the Merger" of the Proxy Statement is
incorporated herein by reference.

      (d) The information set forth in the sections entitled "Summary - The
Merger", "- Assumption of Voltek Stock Options by Thermedics"; "- Conflicts of
Interest"; "- Certain Effects of


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the Merger," "- Federal Income Tax Consequences", "Special Factors - Conflicts
of Interest," "- Certain Effects of the Merger," "- Conduct of Voltek's
Business After the Merger"; "The Merger - Conversion of Securities," 
"- Assumption of Voltek Stock Options by Thermedics," and "Federal Income Tax
Consequences" of the Proxy Statement is incorporated herein by reference.

ITEM 8. FAIRNESS OF THE TRANSACTION.

      (a) The information set forth in the sections entitled "Summary - The
Special Committee's and the Board's Recommendation," "- Position of Thermedics
and Thermo Electron as to Fairness of the Merger," "Special Factors - The
Special Committee's and the Board's Recommendation," and "- Position of
Thermedics and Thermo Electron as to Fairness of the Merger," of the Proxy
Statement is incorporated herein by reference.

      (b) The information set forth in the sections entitled "Summary - The
Special Committee's and the Board's Recommendation," "- Position of Thermedics
and Thermo Electron as to Fairness of the Merger," "Special Factors - Background
of the Merger," "- The Special Committee's and the Board's Recommendation,"
"- Opinion of Financial Advisor," and "Position of Thermedics and Thermo 
Electron as to Fairness of the Merger," of the Proxy Statement is incorporated
herein by reference.

      (c) The information set forth in the sections entitled "Introduction",
"Summary - Vote Required and Revocation of Proxies," "The Special Meeting - 
Voting Procedures," and "The Merger - Conditions" of the Proxy Statement is
incorporated herein by reference.

      (d) The information set forth in the sections entitled "Summary - The
Special Committee's and the Board's Recommendation," "- Opinion of Financial
Advisor," "Special Factors - Background of the Merger," "- The Special
Committee's and the Board's Recommendation," "- Opinion of Financial Advisor"
and in Appendix B to the Proxy Statement is incorporated herein by reference.

      (e) The information set forth in the sections entitled "Summary - The
Special Committee's and the Board's Recommendation" and "Special Factors - The
Special Committee's and the Board's Recommendation" of the Proxy Statement is
incorporated herein by reference.

      (f) None.

ITEM 9. REPORTS, OPINIONS, APPRAISALS AND CERTAIN NEGOTIATIONS.

      (a) - (c) The information set forth in the sections entitled "Summary -
Opinion of Financial Advisor," "Special Factors - Background of the Merger,"
"- Opinion of Financial Advisor," and in Appendix B to the Proxy Statement is
incorporated herein by reference.

ITEM 10. INTEREST IN SECURITIES OF THE ISSUER.

      (a) The information set forth in the sections entitled "Introduction",
"Summary - Vote Required and Revocation of Proxies," "- Conflicts of Interest,"
"Special Factors - Purpose and Reasons of Thermedics and Thermo Electron for the
Merger," "- Conflicts of Interest," "The Special Meeting -

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Voting Procedures," "Security Ownership of Certain Beneficial Owners and
Management" and in Appendix E to the Proxy Statement is incorporated herein by
reference.

      (b) The information set forth in Appendix E to the Proxy Statement is
incorporated herein by reference.

ITEM 11. CONTRACTS, ARRANGEMENTS OR UNDERSTANDINGS WITH RESPECT TO THE ISSUER'S
         SECURITIES.

      (a) The information set forth in the sections entitled "Introduction,"
"Summary - Vote Required and Revocation of Proxies," "- The Merger," "The
Special Meeting - Voting Procedures," "The Merger," and in Appendix A to the
Proxy Statement is incorporated herein by reference.

ITEM 12. PRESENT INTENTION AND RECOMMENDATION OF CERTAIN PERSONS WITH REGARD TO
         THE TRANSACTION.

      (a) The information set forth in the sections entitled "Introduction,"
"Summary - Vote Required and Revocation of Proxies," "The Special Meeting -
Voting Procedures" and in Appendix D to the Proxy Statement is incorporated
herein by reference.

      (b) The information set forth in the sections entitled "Summary - The
Special Committee's and the Board's Recommendation," "- Position of Thermedics
and Thermo Electron as to Fairness of the Merger," "Special Factors - The
Special Committee's and the Board's Recommendation" and "- Position of
Thermedics and Thermo Electron as to Fairness of the Merger" of the Proxy
Statement is incorporated herein by reference.

ITEM 13. OTHER PROVISIONS OF THE TRANSACTION.

      (a) The information set forth in the sections entitled "Summary - Rights
of Dissenting Stockholders", "The Special Meeting - Voting Procedures," "Rights
of Dissenting Stockholders" and in Appendix C of the Proxy Statement is 
incorporated herein by reference.

      (b) Not applicable.

      (c) The information set forth in the section entitled "Special Factors - 
Certain Effects of the Merger" of the Proxy Statement is incorporated herein by 
reference.

ITEM 14. FINANCIAL INFORMATION.

      (a) The information set forth in the sections entitled "Selected Quarterly
Financial Data," "Ratio of Earnings to Fixed Charges," "Selected Financial
Information," and "Consolidated Financial Statements" of the Proxy Statement is
incorporated herein by reference.

      (b) Not applicable.

ITEM 15. PERSONS AND ASSETS EMPLOYED, RETAINED OR UTILIZED.

      (a) The information set forth in the section entitled "The Special Meeting
- - Proxy Solicitation" of the Proxy Statement is incorporated herein by
reference.

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      (b) Not applicable.

ITEM 16. ADDITIONAL INFORMATION.

      The entirety of the Proxy Statement is incorporated herein by reference.

ITEM 17. MATERIAL TO BE FILED AS EXHIBITS.

      (a)  Not applicable.
   
      (b)(1) Opinion of HSBC Securities, Inc. dated November 24, 1998 (included
as Appendix B to the Preliminary Proxy Statement, which is filed herewith as
Exhibit 17(d)(3)).
    

   
      (b)(2) Presentation dated November 24, 1998 to the Special Committee of
the Board of Directors of Thermo Voltek Corp. by HSBC Securities, Inc.
    
      (c)    Agreement and Plan of Merger dated as of November 24, 1998 among
Thermo Voltek Corp., Thermedics Inc. and TV Acquisition Corporation (included
as Appendix A to the Preliminary Proxy Statement, which is filed
herewith as Exhibit 17(d)(3)).

      (d)(1) Preliminary Copy of Letter to Stockholders.

      (d)(2) Preliminary Copy of Notice of Special Meeting of Stockholders.

      (d)(3) Preliminary Proxy Statement.

      (d)(4) Form of Proxy.

      (e)    Text of Section 262 of the General Corporation Law of the State of
Delaware (included as Appendix C to the Preliminary Proxy Statement, which is
filed herewith as Exhibit 17(d)(3)).

      (f)    Preliminary Proxy Statement (see Exhibit 17(d)(3)).




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                                   SIGNATURES

      After due inquiry and to the best of our knowledge and belief, each of the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.

                                    THERMO VOLTEK CORP.

   

Dated: January 19, 1999            By: /s/ Colin I.W. Baxter
                                   ----------------------------------------
                                   Name: Colin I.W. Baxter
                                   Title: President and Chief Operating Officer

                                    THERMEDICS INC.



Dated: January 19, 1999            By: /s/ John T. Keiser
                                   ----------------------------------------
                                   Name: John T. Keiser
                                   Title: President

                                    TV ACQUISITION CORPORATION



Dated: January 19, 1999            By: /s/ John T. Keiser
                                   ----------------------------------------
                                   Name: John T. Keiser
                                   Title: President

                                    THERMO ELECTRON CORPORATION



Dated: January 19, 1999            By: /s/ Kenneth J. Apicerno
                                   ----------------------------------------
                                    Name: Kenneth J. Apicerno
                                    Title: Treasurer
    

                                       14

   15
                                  EXHIBIT INDEX


Exhibit Number          Description
   
      99.17(b)(1)   Opinion of HSBC Securities, Inc. dated November 24, 1998
(included as Appendix B to the preliminary Proxy Statement, which is filed
herewith as Exhibit 99.17(d)(3)).
    

   
      99.17(b)(2)    Presentation dated November 24, 1998 to the Special
Committee of the Board of Directors of Thermo Voltek Corp. by HSBC Securities, 
Inc.
    
      99.17(c)      Agreement and Plan of Merger dated as of November 24, 1998
among Thermo Voltek Corp., Thermedics Inc. and TV Acquisition Corporation
(included as Appendix A to the Preliminary Proxy Statement, which is filed
herewith as Exhibit 99.17(d)(3)).

      99.17(d)(1)   Preliminary Copy of Letter to Stockholders.

      99.17(d)(2)   Preliminary Copy of Notice of Special Meeting of
Stockholders.

      99.17(d)(3)   Preliminary Proxy Statement.

      99.17(d)(4)   Form of Proxy.

      99.17(e)      Text of Section 262 of the General Corporation Law of the
State of Delaware (included as Appendix C to the Preliminary Proxy Statement,
which is filed herewith as Exhibit 99.17(d)(3)).

      99.17(f)      Preliminary Proxy Statement (see Exhibit 99.17(d)(3)).




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