THERMO ELECTRON CORP
SC 13D/A, 1998-07-07
MEASURING & CONTROLLING DEVICES, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 4)

                            ThermoSpectra Corporation

                                (Name of Issuer)

                     Common Stock, par value $.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   883660-10-2
                                 (CUSIP Number)


                             Seth H. Hoogasian, Esq.
                                 General Counsel
                                  (781)622-1000

                           Thermo Electron Corporation
                                 81 Wyman Street
                             Waltham, MA 02254-9046

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

 (Name, Address and Telephone Number of Person Authorized to Receive Notices 
                              and Communications)


                                  June 15, 1998
- -------------------------------------------------------------------------------
             (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 the
disclosures provided in a prior cover page.


     The  information  required in the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 (the "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).

<PAGE>


- ---------- --------------------------------------------------------------------
 1             NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                        Thermo Electron Corporation
                                        IRS No. 04-2209186

- ----------  -------------------------------------------------------------------
2              CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                 (a)  [   ]
                                                                 (b)  [ x ]
- ---------  -------------------------------------------------------------------

3              SEC USE ONLY
- ----------  -------------------------------------------------------------------

4              SOURCE OF FUNDS*


                WC

- ----------  ------------------------------------------------------------------- 
5              CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
               PURSUANT TO ITEMS 2(d) or 2(e)
                                                                      [   ]
- ----------  -------------------------------------------------------------------
                  6                     CITIZENSHIP OR PLACE OF ORGANIZATION


                                        State of Delaware
- ----------  -------------------------------------------------------------------
     NUMBER OF SHARES           7       SOLE VOTING POWER
  BENEFICIALLY OWNED BY
  EACH REPORTING PERSON
           WITH                         10,291,389
- --------------------------- ----------- ---------------------------------------
                                8       SHARED VOTING POWER


                                        0
- --------------------------- ----------- ---------------------------------------
                                9       SOLE DISPOSITIVE POWER


                                        10,291,389
- --------------------------- ----------- ---------------------------------------
                                10      SHARED DISPOSITIVE POWER


                                        0
- --------------------------- ----------- ---------------------------------------


<PAGE>


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

             10,291,389

- ----------  -------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
            SHARES*                                            [   ]
- ----------  -------------------------------------------------------------------
13             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11


               67.2%
- ----------  -------------------------------------------------------------------
14             TYPE OF REPORTING PERSON *

               CO
- ----------  -------------------------------------------------------------------

<PAGE>


         Thermo Electron Corporation hereby amends its statement on Schedule 13D
relating to the shares (the "Shares") of common stock, par value $.01 per share,
of ThermoSpectra Corporation (the "Issuer"), as set forth below.

Item 2.  Identity and Background

         Item 2 is hereby amended and restated in its entirety as follows:

     This  Amendment  is  being  filed  by  Thermo  Electron   Corporation  (the
"Reporting  Person"),  pursuant  to Rule  13d-2,  to reflect an  increase in the
Reporting  Person's holdings of the Issuer's Shares since the Reporting Person's
last  filing on  Schedule  13D, in April  1998,  of more than one  percent.  The
Reporting  Person  holds the Shares of the Issuer  that are the  subject of this
Amendment  through one or more controlled  subsidiaries.  As of the date of this
Amendment, 8,998,836 Shares were held by Thermo Instrument Systems Inc. ("Thermo
Instrument"), a majority-owned subsidiary of the Reporting Person.

         The Reporting Person develops,  manufactures and markets environmental,
analytical and process control instruments, cogeneration and alternative-energy
power  plants,   low-emission  combustion  systems,  paper  and  waste-recycling
equipment,  and biomedical products.  The Reporting Person also provides a range
of services  including  environmental  remediation  and  consulting,  laboratory
analysis, and metals fabrication and processing, as well as research and product
development  in  unconventional  imaging,  adaptive  optics,  and direct  energy
conversion.

         The  principal  business  address and principal  office  address of the
Reporting  Person,  a  Delaware  corporation,   is  81  Wyman  Street,  Waltham,
Massachusetts 02254-9046.

         Appendix A attached to this  Amendment  sets forth with respect to each
executive  officer and director of the Reporting Person his or her (a) name; (b)
residence or business address;  (c) present  principal  occupation or employment
and the  name,  principal  business  and  address  of any  corporation  or other
organization in which such employment is conducted; and (d) citizenship.  To the
knowledge of the  Reporting  Person,  there is no person who may be deemed to be
a controlling person of the Reporting Person.

         During the last five years,  neither the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting Person has been convicted in a criminal proceeding (excluding traffic
violations and similar misdemeanors).



<PAGE>


         During the last five years,  neither the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting  Person  has  been a party  to a civil  proceeding  of a  judicial  or
administrative  body of competent  jurisdiction  which  resulted in a judgement,
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.

Item 3.  Source and Amount of Funds or Other Consideration.

         Item 3 is hereby amended and restated in its entirety as follows:

         The  Reporting   Person  has  expended   approximately   $2,750,000  in
purchasing  Shares of the Issuer  since the date of its last  filing on Schedule
13D. These funds were paid out of the Reporting Person's working capital.

Item 4.  Purpose of Transaction

         Item 4 is hereby amended and restated in its entirety as follows:

         The Reporting  Person may make purchases of Shares or other  securities
of the  Issuer  in  such  manner  and in such  amounts  as it  determines  to be
appropriate  in order to maintain at least 50% ownership of the Issuer by Thermo
Instrument. The Reporting Person may also make additional purchases of Shares or
other  securities  of the  Issuer  in  such  manner  and in such  amounts  as it
determines to be appropriate for other purposes. In determining whether to do so
for other purposes, the Reporting Person will consider various relevant factors,
including  its  evaluation  of the Issuer's  business,  prospects  and financial
condition,  amounts and prices of available securities of the Issuer, the market
for the Issuer's  securities,  other  opportunities  available to the  Reporting
Person and general market and economic conditions.  Purchases may be made either
on the open market or directly from the Issuer.

         Except as set forth in this Item 4 and Item 6,  neither  the  Reporting
Person nor, to the Reporting Person's  knowledge,  any of the executive officers
or directors of the Reporting  Person has any current  plans or proposals  which
relate to or would result in any of the actions specified in clauses (a) through
(j) of Item 4 of Schedule  13D,  although  the  Reporting  Person and such other
persons do not rule out the  possibility  of  effecting or seeking to effect any
such actions in the future.



<PAGE>


Item 5.  Interest in Securities of the Issuer.

         Items 5 (a) - (c) are hereby  amended and restated in their entirety as
follows:

         (a)  The  Shares  beneficially  owned by the Reporting  Person
include 1,292,553 Shares, or approximately 8.4% of the outstanding Shares, owned
directly by the Reporting Person,  and 8,998,836 Shares, or approximately  58.7%
of the outstanding Shares,  owned by Thermo Instrument.  To the knowledge of the
Reporting Person,  the executive  officers and directors of the Reporting Person
beneficially  own an aggregate of 185,650  Shares or  approximately  1.2% of the
outstanding  Shares.  To the  knowledge  of the  Reporting  Person,  the  Shares
beneficially  owned by all  executive  officers and  directors of the  Reporting
Person include 168,650 Shares that such persons have the right to acquire within
60 days through the exercise of stock options.  Ownership  information  for each
executive officer and director of the Reporting Person is set forth below.

Name                                                        Nmber of Shares(1)
- ----                                                      -------------------
John M. Albertine                                                       1,000
Peter O. Crisp                                                          1,000
Elias P. Gyftopoulos                                                   21,000
George N. Hatsopoulos                                                  24,750
John N. Hatsopoulos                                                    24,400
Frank Jungers                                                           5,500
Paul F. Kelleher                                                        5,000
Earl R. Lewis                                                          55,000
Robert A. McCabe                                                        1,500
Frank E. Morris                                                         1,000
Donald E. Noble                                                         4,000
Robert W. O'Leary                                                           0
Hutham S. Olayan                                                        1,000
Peter G. Pantazelos                                                     4,500
William A. Rainville                                                   10,000
Arvin H. Smith                                                         20,000
Richard F. Syron                                                            0
Roger D. Wellington                                                     1,000
John W. Wood Jr.                                                        5,000
All directors and current executive officers as a group (19 persons)  185,650

     (1) Shares reported as beneficially owned by Dr. Albertine,  Mr. Crisp, Dr.
Gyftopoulos,  Dr. G. Hatsopoulos, Mr. J. Hatsopoulos, Mr. Jungers, Mr. Kelleher,
Mr. Lewis, Mr. McCabe, Dr. Morris,  Mr. Noble, Ms. Olayan,  Mr. Pantazelos,  Mr.
Rainville,  Mr. Smith, Mr. Wellington,  Mr. Wood and all directors and executive
officers as a group include 1,000, 1,000, 20,000,  24,750, 24,400, 1,500, 5,000,
50,000,  1,500, 1,000, 1,000, 1,000,  2,500,  10,000,  20,000,  1,000, 3,000 and
168,650 Shares, respectively,  that such person or members of the group have the
right to acquire within 60 days.

While certain directors and executive  officers of the Reporting Person are also
directors  and  officers of the Issuer,  all such  persons  disclaim  beneficial
ownership of the Shares owned by the Reporting Person.

(b) The  Reporting  Person  and the  executive  officers  and  directors  of the
Reporting Person have the sole power to vote and dispose of the Shares each such
person owns.

     (c) The  Reporting  Person has effected  the  following  transactions  with
respect to the Shares during the past 60 days:

Date           Amount           Price Per           Transfer Type
                                  Share
- ---------- -------------- ------------------ ----------------------------------
05/13/98       8,800               $9.56          Open Market Purchase
05/14/98       1,500               $9.75          Open Market Purchase
05/14/98      13,300               $10.00         Open Market Purchase
05/15/98      14,800               $10.23         Open Market Purchase
05/18/98         200               $10.25         Open Market Purchase
05/19/98       2,000               $11.13         Open Market Purchase
05/19/98       1,900               $11.00         Open Market Purchase
05/20/98       2,000               $11.38         Open Market Purchase
05/20/98       1,900               $11.25         Open Market Purchase
05/21/98      10,000               $11.31         Open Market Purchase
05/21/98       2,200               $11.31         Open Market Purchase
05/22/98         900               $11.25         Open Market Purchase
05/26/98       7,600               $11.38         Open Market Purchase
05/26/98       7,500               $11.13         Open Market Purchase
05/26/98         900               $11.00         Open Market Purchase
05/27/98       3,500               $11.00         Open Market Purchase
05/28/98      15,500               $11.06         Open Market Purchase
05/28/98       7,000               $11.00         Open Market Purchase
05/29/98       2,400               $11.00         Open Market Purchase
06/01/98       3,700               $11.00         Open Market Purchase
06/03/98      14,800               $11.00         Open Market Purchase
06/04/98       6,000               $11.00         Open Market Purchase
06/05/98      22,900               $11.31         Open Market Purchase
06/08/98       1,700               $11.38         Open Market Purchase
06/08/98         800               $11.31         Open Market Purchase
06/09/98       2,500               $11.31         Open Market Purchase
06/10/98       2,500               $11.31         Open Market Purchase
06/11/98       2,500               $11.25         Open Market Purchase
06/15/98      11,100               $11.00         Open Market Purchase
06/17/98      19,800               $9.69          Open Market Purchase
06/17/98      12,600               $9.63          Open Market Purchase
06/18/98       8,000               $9.88          Open Market Purchase
06/18/98      11,100               $10.00         Open Market Purchase
06/18/98      10,500               $9.88          Open Market Purchase
06/19/98       2,100               $10.00         Open Market Purchase
06/22/98       2,200               $10.00         Open Market Purchase
06/23/98       2,200               $10.25         Open Market Purchase
06/24/98       2,200               $10.50         Open Market Purchase
06/25/98         900               $10.56         Open Market Purchase
06/29/98       2,100               $10.44         Open Market Purchase
06/30/98       5,000               $10.50         Open Market Purchase
06/30/98       2,100               $10.56         Open Market Purchase

To the knowledge of the Reporting Person,  the executive  officers and directors
of the Reporting  Person have effected no transactions in the Shares in the past
60 days,  except  as  follows:  On May 12,  1998,  Mr.  Frank  Jungers  sold the
following Shares in the open market:  (i) 2,000 Shares at $9.625 per Share; (ii)
200 Shares at $9.563 per Share; and (iii) 1,800 Shares at $9.50 per Share.



<PAGE>


Item 6. Contracts, Arrangements, Understandings or Relationships with respect to
Securities of the Issuer.

         The first  paragraph  of Item 6 is hereby  amended and  restated in its
entirety as follows:

         Of the 10,291,389  Shares  beneficially  owned by the Reporting Person,
48,800  Shares are  subject to options  to acquire  such  Shares  granted by the
Reporting  Person pursuant to its director and employee stock option plans.  The
executive  officers  and  directors  of the  Reporting  Person  have the  right,
pursuant to such options,  to acquire 15,150 Shares. In addition,  the following
executive  officers  and  directors  of the  Reporting  Person have the right to
acquire  shares from the Issuer  pursuant to the Issuer's  director and employee
stock option plans:  Dr. George N.  Hatsopoulos  has the right to acquire 24,750
Shares within 60 days; Mr. John N.  Hatsopoulos  has the right to acquire 24,400
Shares within 60 days; Mr. Arvin H. Smith has the right to acquire 20,000 Shares
within 60 days; Dr. Elias P.  Gyftopoulos has the right to acquire 20,000 Shares
within 60 days;  Mr. William A. Rainville has the right to acquire 10,000 Shares
within 60 days;  and Mr. Paul F.  Kelleher has the right to acquire 5,000 Shares
within 60 days.



<PAGE>


Signature

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

Date:    July 6, 1998

                                                     THERMO ELECTRON CORPORATION

                                                     By: /s/ Melissa F. Riordan
                                                         Melissa F. Riordan
                                                         Treasurer

<PAGE>







         Appendix A is hereby amended and restated in its entirety as follows:

                                   APPENDIX A

         The following individuals are executive officers or directors of Thermo
Electron  Corporation  ("Thermo  Electron").  Unless  otherwise  noted, all such
individuals  are citizens of the United  States.  Unless  otherwise  noted,  the
business  address  of each  executive  officer  of Thermo  Electron  is 81 Wyman
Street, Waltham, Massachusetts 02254-9046.



John M. Albertine:                           Director, Thermo Electron

         Dr.  Albertine is Chairman of the Board and Chief Executive  Officer of
Albertine Enterprises,  Inc., an economic and public policy consulting firm. His
business  address is Albertine  Enterprises,  Inc., 1156 15th Street N.W., Suite
505, Washington, DC 20005.

Peter O. Crisp:                              Director, Thermo Electron

     Mr. Crisp was, until August 1997, a General Partner of Venrock  Associates,
a venture capital investment firm. His address is 103 Horseshoe Road, Mill Neck,
New York 11765-1005.

Elias P. Gyftopoulos:                        Director, Thermo Electron

     Dr.  Gyftopoulos is Professor  Emeritus of the  Massachusetts  Institute of
Technology. His business address is Massachusetts Institute of Technology,  Room
24-109, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139.

Frank Jungers:                               Director, Thermo Electron

     Mr.  Jungers is a consultant on business and energy  matters.  His business
address is 822 NW Murray, Suite 242, Portland, Oregon 97229.

Robert A. McCabe:                            Director, Thermo Electron

     Mr. McCabe is President of Pilot Capital  Corporation,  a firm specializing
in private  investment and acquisition  services.  His business address is Pilot
Capital Corporation, 444 Madison Avenue, Suite 2103, New York, New York 10022.



<PAGE>


Frank E. Morris:                             Director, Thermo Electron

     Dr. Morris  served as President of the Federal  Reserve Bank of Boston from
1968 until he retired  in 1988.  Dr.  Morris  also  served as the Peter  Drucker
Professor of Management  at Boston  College from 1989 to 1994.  His  residential
address is P.O. Box 825, 24 Sugarhouse Road, New London, New Hampshire 03257.

Donald E. Noble:                             Director, Thermo Electron

         For more than 20  years,  from 1959 to 1980,  Mr.  Noble  served as the
Chief  Executive  Officer of Rubbermaid,  Incorporated,  first with the title of
President and then as Chairman of the Board.  His business address is Rubbermaid
Incorporated, 1147 Akron Road, Wooster, Ohio 44691.

Robert W. O'Leary:                           Director, Thermo Electron

     Mr. O'Leary is the Chairman and Chief Executive Officer of Premier, Inc., a
strategic healthcare alliance.  His business address is Premier,  Inc., 12225 El
Camino Real, San Diego, California 92130.

Hutham S. Olayan:                            Director, Thermo Electron

     Ms. Olayan is the President  and a director of Olayan  America  Corporation
and  President  of  Competrol  Real Estate  Limited,  firms  engaged in advisory
services and private  real estate  investments.  Her  business  address is Suite
1100,  505 Park Avenue,  New York,  New York 10022.  Ms.  Olayan is a citizen of
Saudi Arabia.

Richard F. Syron:                            Director, Thermo Electron

     Mr.  Syron has served as the Chairman  and Chief  Executive  Officer of the
American Stock Exchange since 1994. Mr. Syron was President and Chief  Executive
Officer of the Federal  Reserve  Bank of Boston from 1989 to 1994.  His business
address is 86 Trinity Place, New York, New York 10006.

Roger D. Wellington:                         Director, Thermo Electron

     Mr.  Wellington is the President and Chief executive  Officer of Wellington
Consultants,  Inc. and of Wellington  Associates,  Inc.,  international business
consulting firms. His address is P.O. Box 8186, Longboat Key, Florida 34228.

George N. Hatsopoulos:                       Director, Chairman of the Board  
                                             and Chief Executive Officer, 
                                             Thermo Electron
John N. Hatsopoulos:                         Director, President and Chief 
                                             Financial Officer, Thermo Electron
Peter G. Pantazelos:                         Executive Vice President, 
                                             Corporate Development,
                                             Thermo Electron
Earl R. Lewis:                               Senior Vice President, 
                                             Thermo Electron
Arvin H. Smith:                              Eecutive Vice President, 
                                             Thermo Electron
William A. Rainville:                        Senior Vice President, 
                                             Thermo Electron
John W. Wood Jr.:                            Senior Vice President,
                                             Thermo Electron
Paul F. Kelleher:                            Senior Vice President,
                                             Finance & Administration and 
                                             Chief Accounting Officer, 
                                             Thermo Electron


<PAGE>






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