THERMOSPECTRA CORP
424B3, 1996-09-12
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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                                                     Filed Pursuant to
                                                     Rules 424(b)(3) and 
                                                     424(c) of the Securities
                                                     Act of 1933 Registration
                                                     No. 33-99110

                              Prospectus Supplement
                              ---------------------

                            Supplement to Prospectus
                                      dated
                                 April 25, 1996
             and Supplemented on June 6, 1996 and Spetember 11, 1996

                            THERMOSPECTRA CORPORATION
                                    1,707,000
                                  Common Stock

        This prospectus supplement relates to 1,707,000 shares of Common
   Stock, par value $.01 per share, of ThermoSpectra Corporation (the
   "Company").

        THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
   SECURITIES AND EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE
   ACCURACY OR ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE
   CONTRARY IS A CRIMINAL OFFENSE.

        No dealer, salesman or any other person has been authorized to give
   any information or to make any representations in connection with this
   offering other than those contained in this Prospectus and, if given or
   made, such information or representation must not be relied upon as having
   been authorized by the company or by any other person.  All information
   contained in this Prospectus is as of the date of this Prospectus.  This
   Prospectus does not constitute any offer to sell or a solicitation of any
   offer to buy any security other than the securities covered by this
   Prospectus, nor does it constitute an offer to or solicitation of any
   person in any jurisdiction in which such offer or solicitation may not be
   lawfully made.  Neither the delivery of this Prospectus nor any sale or
   distribution made hereunder shall, under any circumstances, create any
   implication that there has been no change in the affairs of the Company
   since the date hereof.

                      ____________________________________

   September 12, 1996
PAGE
<PAGE>





   Item 2.  Acquisition or Disposition of Assets
            ------------------------------------

        On August 5, 1996, ThermoSpectra Corporation (the "Company") acquired
   substantially all of the assets (the "Assets") of NK Instruments Inc.
   ("NK"), a wholly-owned subsidiary of the Company's parent, Thermo
   Instrument Systems Inc. ("THI"), for $21,527,000 in cash (the "Purchase
   Price").  The Assets consist of the businesses of Kevex, Inc., a
   manufacturer of X-ray microanalyzers and X-ray microfluorescence
   instruments based in Valencia, California and Kevex X-Ray, Inc., a
   manufacturer of micofocus X-ray tubes based in Scotts Valley, California
   (together, the "Kevex Businesses").  The Kevex Businesses were acquired by
   THI on March 29, 1996 as part of its purchase of substantially all of the
   businesses comprising the Scientific Instruments Division of Fisons plc
   ("Fisons"), a wholly-owned subsidiary of Rhone-Poulenc Rorer Inc.

        The Purchase Price represents the sum of (i) the net book value of the
   Kevex Businesses at March 29, 1996 and (ii) the portion of the total
   goodwill associated with THI's acquisition of the Fisons businesses equal
   to the sales of the Kevex Businesses for the 1994 and 1995 fiscal years
   relative to the total sales for such years of all of the Fisons businesses
   acquired by THI.

        The acquisition was made pursuant to an Asset Purchase Agreement dated
   as of August 5, 1996 (the "Agreement"), among Kevex Instruments Inc., a
   wholly-owned subsidiary of the Company, NK and THI.  Under the terms of the
   Agreement, the Purchase Price is subject to a post-closing adjustment based
   on a post-closing adjustment to be negotiated between THI and Fisons.  To
   fund part of this acquisition, the Company borrowed $15,000,000 from Thermo
   Electron Corporation pursuant to a promissory note due 1998 and bearing
   interest at the 90-day Commercial Paper Composite Rate plus 25 basis
   points, set at the beginning of each quarter.  The remainder of the
   Purchase Price was funded from cash on hand.  

        The Company has no present intention to use the Assets for purposes
   materially different from the purposes for which such assets were used
   prior to the acquisition.  However, the Company will review the Kevex
   Businesses and their assets, corporate structure, capitalization,
   operations, properties, policies, management and personnel and, upon
   completion of this review, may develop alternative plans or proposals,
   including mergers, transfers of a material amount of assets or other
   transactions or changes relating to such businesses.
PAGE
<PAGE>





   Item 7.  Financial Statements, Pro Forma Combined Condensed Financial
            ------------------------------------------------------------
            Information and Exhibits
            ------------------------

            (a) Financial Statements of Business Acquired: as it is
                impracticable to file such information at this time, it will
                be filed by amendment on or prior to October 18, 1996.

            (b) Pro Forma Combined Condensed Financial Information: as it is
                impracticable to file such information at this time, it will
                be filed by amendment on or prior to October 18, 1996.

            (c) Exhibits

            2   Asset Purchase Agreement dated as of August 5, 1996 by and
                among Kevex Instruments Inc., NK Instruments Inc. and Thermo
                Instrument Systems Inc. (filed as Exhibit 2 to the Company's
                Quarterly Report on Form 10-Q for the quarter ended June 29,
                1996 and incorporated herein by reference). 

          10.1  $15,000,000 Promissory Note dated as of August 5, 1996 issued
                by the Company to Thermo Electron Corporation (filed as
                Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q
                for the quarter ended June 29, 1996 and incorporated herein
                by reference).
PAGE
<PAGE>





                                   SIGNATURES



        Pursuant to the requirements 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, on this 16th day of August 1996.

                                        THERMOSPECTRA CORPORATION


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









   AA962550035



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