UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549

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

                                    FORM 11-K


(mark one)
[ X ] Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 
      1934 for the Fiscal Year Ended December 31, 2004

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

                          Commission File Number 1-8002

                     THERMO ELECTRON CORPORATION CHOICE PLAN

      A. Full title of the plan and address of the plan, if different from that 
         of the issuer named below:

                     Thermo Electron Corporation Choice Plan

      B. Name of issuer of the securities held pursuant to the plan and the 
         address of the principal executive office:

         Thermo Electron Corporation
         81 Wyman Street
         P.O. Box 9046 Waltham, Massachusetts 02454-9046







Thermo Electron Corporation Choice Plan
December 31, 2004 and 2003
--------------------------------------------------------------------------------

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
trustees (or other persons who administer the employee benefit plan) have duly
caused this annual report to be signed by the undersigned hereunto duly
authorized.

              THERMO ELECTRON CORPORATION CHOICE PLAN

              By:   Thermo Electron Corporation, Pension Committee


              By:   /s/ Peter M. Wilver                                     
                    ------------------------------------------------------------
                    Peter M. Wilver
                    Chief Financial Officer and Member of the Plan Administrator

Date:  June 27, 2005






                    Thermo Electron Corporation Choice Plan

               Financial Statements and Supplementary Information

                           December 31, 2004 and 2003






Thermo Electron Corporation Choice Plan
Index
December 31, 2004 and 2003
--------------------------------------------------------------------------------

                                                                         Page(s)

Report of Independent Registered Public Accounting Firm ................     1

Financial Statements

Statements of Net Assets Available for Benefits ........................     2

Statement of Changes in Net Assets Available for Benefits ..............     3

Notes to Financial Statements ..........................................   4-7

Supplementary Schedule*

Schedule H, line 4i - Schedule of Assets (Held at End of Year) .........     8


* Other supplemental schedules required by Section 2520-103.10 of the Department
  of Labor's Rules and Regulations for Reporting and Disclosure under the
  Employee Retirement Income Security Act of 1974 have been omitted because they
  are not applicable.






Thermo Electron Corporation Choice Plan
Report of Independent Registered Public Accounting Firm
--------------------------------------------------------------------------------
                                        
To the Participants, Administrator and Pension Committee of
Thermo Electron Corporation Choice Plan


In our opinion, the accompanying statements of net assets available for benefits
and the related statement of changes in net assets available for benefits
present fairly, in all material respects, the net assets available for benefits
of Thermo Electron Corporation Choice Plan (the "Plan") at December 31, 2004 and
2003, and the changes in net assets available for benefits for the year ended
December 31, 2004 in conformity with accounting principles generally accepted in
the United States of America. These financial statements are the responsibility
of the Plan's management. Our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
statements in accordance with the standards of the Public Company Accounting
Oversight Board (United States). Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

Our audits were conducted for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule H, line 4i -
schedule of assets (held at end of year) is presented for the purpose of
additional analysis and is not a required part of the basic financial statements
but is supplementary information required by the Department of Labor's Rules and
Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974. This supplemental schedule is the responsibility of the
Plan's management. The supplemental schedule has been subjected to the auditing
procedures applied in the audit of the basic financial statements and, in our
opinion, is fairly stated in all material respects in relation to the basic
financial statements taken as a whole.



PricewaterhouseCoopers LLP

Boston, Massachusetts
June 16, 2005



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Thermo Electron Corporation Choice Plan
Statements of Net Assets Available for Benefits
December 31, 2004 and 2003
--------------------------------------------------------------------------------



                                                                                                                  

                                                                                                       2004              2003
                                                                                                   ------------      ------------

Assets
Investments, at fair value                                                                         $440,863,541      $427,399,405
Loans to participants                                                                                 4,753,201         5,636,340
                                                                                                   ------------      ------------

                                                                                                    445,616,742       433,035,745

Receivables
 Employer contributions                                                                                 592,222           712,594
 Participant contributions                                                                            1,169,561         1,442,413
 Accrued income                                                                                           1,175               548
                                                                                                   ------------      ------------

                                                                                                      1,762,958         2,155,555

    Net assets available for benefits                                                              $447,379,700      $435,191,300
                                                                                                   ============      ============




                                             See accompanying notes to financial statements.






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Thermo Electron Corporation Choice Plan
Statement of Changes in Net Assets Available for Benefits
For the Year Ended December 31, 2004
--------------------------------------------------------------------------------


                                                                                                                   


Addition to net assets attributed to investment income
 Interest and dividends                                                                                              $ 11,802,787
 Net appreciation in fair value of investments                                                                         33,116,814
                                                                                                                     ------------

    Total investment income                                                                                            44,919,601
                                                                                                                     ------------

Contributions
 Employer                                                                                                              10,389,386
 Participants                                                                                                          23,357,094
                                                                                                                     ------------

    Total contributions                                                                                                33,746,480
                                                                                                                     ------------

Deductions from net assets attributed to
 Benefits paid to participants                                                                                        (45,707,507)
 Administrative expenses                                                                                                  (76,925)
                                                                                                                     ------------

    Total deductions                                                                                                  (45,784,432)
                                                                                                                     ------------

Transfers
 Distribution of plan assets from divestiture of Spectra-Physics                                                      (20,715,716)
 Merger with CRS Robotics 401(k) plan                                                                                      22,467
                                                                                                                     ------------

    Total transfers                                                                                                   (20,693,249)
                                                                                                                     ------------

Net increase in net assets available for benefits                                                                      12,188,400

Net assets available for benefits
 Beginning of year                                                                                                    435,191,300
                                                                                                                     ------------

 End of year                                                                                                         $447,379,700
                                                                                                                     ============


                                          See accompanying notes to financial statements.


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Thermo Electron Corporation Choice Plan
Notes to Financial Statements
December 31, 2004 and 2003
--------------------------------------------------------------------------------

1.      Plan Description

        The following description of the Thermo Electron Corporation Choice Plan
        (the Plan) provides only general information. Participants should refer
        to the Plan agreement for a more complete description of the Plan's
        provisions.

        General
        The Plan is a defined contribution plan. The Plan covers eligible
        full-time and part-time employees of Thermo Electron Corporation and
        subsidiaries (the Company) who have completed two months of service. The
        Plan is subject to the provisions of the Employee Retirement Income
        Security Act of 1974 (ERISA).

        In 2002, the Company purchased CRS Robotics Corporation. On May 17,
        2004, the CRS Robotics 401(k) Plan was merged into the Plan. The balance
        of $22,467 for the net assets available for benefits as of May 17, 2004
        was transferred into the Plan.

        In July 2004, the Company sold its Spectra-Physics, Inc. business. In
        connection with the sale, Plan participants who were Spectra-Physics
        employees became terminated employees and as such, were eligible to
        receive a distribution of their account balances. In 2004, the Plan
        distributed a direct rollover of such participants' account balances
        totaling $20,715,716 to the defined contribution plan of
        Spectra-Physics' acquirer.

        Contributions
        Each year participants may contribute up to 50% of pre-tax annual
        compensation or $13,000, as defined in the Plan. Participants may also
        contribute amounts representing distributions from other qualified
        defined benefit or defined contribution plans. Beginning on the first
        day of the calendar month following completion of one year of service,
        the Company makes non-discretionary matching contributions equal to 200%
        of the first 2% and 25% of the next 2% of base compensation that a
        participant contributes to the Plan. Participants direct the investment
        of their contributions and the Company match into various investment
        options offered by the Plan. The Plan currently offers the Company's
        common stock fund and sixteen investment funds as investment options for
        participants. Contributions are subject to certain limitations. Employee
        contributions and Company match are recorded on a monthly basis.

        Participant Accounts
        Each participant's account is credited with the participant's
        contributions and allocations of the Company's contribution and plan
        earnings, and charged with an allocation of administrative expenses, if
        any. Allocations are based on participant earnings or account balances,
        as defined. The benefit to which a participant is entitled is the
        benefit that can be provided from the participant's vested account.

        Vesting
        Participants are immediately vested in their voluntary contributions
        plus actual earnings thereon. Vesting in the Company matching
        contributions plus actual earnings thereon is based on years of service.
        A participant is 100% vested after three years of credited service.

        A participant is automatically 100% vested in all contributions upon the
        attainment of age 65, upon becoming permanently disabled, or upon death
        while still an active participant.

        Participant Loans
        Participants may only borrow from their employee portion of fund
        accounts a minimum of $1,000 up to a maximum equal to $50,000 or 50% of
        the vested account balance, whichever is less. The term of the loan is
        generally five years except when use of the proceeds is for the purchase
        of a primary residence, for which the term can be up to 30 years. The
        loans are secured by the balance in the participant's account and bear
        interest at

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Thermo Electron Corporation Choice Plan
Notes to Financial Statements
December 31, 2004 and 2003
--------------------------------------------------------------------------------

        a rate commensurate with local prevailing rates as determined by the
        plan administrator. The interest rates on plan loans range from 5% to
        10.75% at December 31, 2004, and 5% to 11% at December 31, 2003.
        Principal and interest are repaid through payroll deductions.

        Benefit Payments and Plan Withdrawals
        On termination of service due to death, disability or retirement, a
        participant (or beneficiary) may elect to receive either a lump-sum
        amount equal to the value of the participant's vested interest in his or
        her account or periodic installments. For termination of service due to
        other reasons, a participant may receive the value of the vested
        interest in his or her account as a lump-sum distribution. Withdrawals
        may be made under certain other circumstances in accordance with the
        Plan document.

        Forfeitures
        Upon a participant's break in service, as defined, the nonvested portion
        of the participant's account is forfeited and is used to reduce the
        Company's future funding requirements. If a participant who has
        terminated employment is rehired by the Company before the greater of a
        five-year break in service or the number of the participant's years of
        service prior to the participant's break in service, the participant
        shall be reinstated in such forfeited amount. In 2004, Company
        contributions were reduced by $318,207 from forfeited nonvested
        accounts.

        Transfer In/Out
        In connection with certain reorganization activities at the Company, the
        assets of certain other plans sponsored by subsidiaries of the Company
        have been transferred into the Plan in connection with the merger of
        those plans. Additionally, the reorganization has involved a number of
        business dispositions. As a result, the plan assets in the accounts of
        the affected employees have sometimes been transferred to plans
        sponsored by the acquirers of these businesses disposed.

2.      Summary of Significant Accounting Policies

        Use of Estimates
        The Plan's financial statements are prepared on the accrual basis of
        accounting. The preparation of the financial statements in conformity
        with accounting principles generally accepted in the United States of
        America requires management to make estimates and assumptions that
        affect the reported amounts of assets and liabilities and changes
        therein. Actual results could differ from those estimates.

        Investment Valuation
        Investments are stated at fair value as determined by Fidelity
        Management Trust Company, a trust company that is the trustee and
        custodian of the Plan's investment assets. Common shares are valued
        based on quoted market prices. Registered investment companies and bank
        collective investment funds are valued based on net asset value.
        Participant loans are valued at cost plus accrued interest, which
        approximates fair value.

        Purchases and sales of investments are recorded on a trade-date basis.
        Interest income is recorded on the accrual basis. Dividends are recorded
        on the ex-dividend date.

        In the statement of changes in net assets available for benefits, the
        Plan presents the net appreciation in the fair value of its investments,
        which consists of realized gains or losses and unrealized appreciation
        on investments. The cost of investments is determined using the
        average-cost basis for calculating realized gains or losses.

        Payment of Benefits 
        Benefits are recorded when paid.

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Thermo Electron Corporation Choice Plan
Notes to Financial Statements
December 31, 2004 and 2003
--------------------------------------------------------------------------------

        Risks and Uncertainties
        The Plan invests in a combination of investment securities that are
        exposed to various risks, such as interest rate, market and credit. Due
        to the level of risk associated with certain investment securities and
        the level of uncertainty related to changes in the value of investment
        securities, it is at least reasonably possible that changes in risks in
        the near term would materially affect participants' account balances and
        the amounts reported in the statement of net assets available for
        benefits and the statement of changes in net assets available for
        benefits.

3.      Tax Status

        The Plan has received a favorable determination letter dated September
        18, 2003, from the Internal Revenue Service. The Plan has been amended
        since receiving the determination letter; however, the Plan
        administrator, management and the Plan's tax counsel believe that the
        Plan has been designed and operated in compliance with the applicable
        requirements of the Internal Revenue Code.

4.      Investments

        The fair value of the Plan investments is determined by quoted market
        prices. Investments of the Plan's net assets are as follows:



                                                                                                                

                                                                                                            December 31,
                                                                                                   ------------------------------
                                                                                                       2004              2003
                                                                                                   ------------      ------------

          Mutual Funds:
             Dodge and Cox Stock Fund *                                                            $ 83,953,751      $ 68,531,423
             Fidelity Balanced Fund*                                                                 53,653,572        53,083,335
             Fidelity Blue Chip Growth Fund*                                                         48,564,525        53,078,631
             Spartan U.S. Equity Index Fund*                                                         46,959,389                 -
             Fidelity Growth Company Fund*                                                           33,206,584        31,880,444
             Fidelity Diversified International Fund*                                                32,820,890        25,597,955
             T. Rowe Price Small-Cap Stock Fund, Inc. *                                              22,373,284        17,910,263
             Fidelity Magellan Fund                                                                           -        30,880,451
             Freedom 2000 Fund                                                                          568,472           623,829
             Freedom 2010 Fund                                                                        1,930,488         1,596,544
             Freedom 2020 Fund                                                                        4,011,945         3,225,503
             Freedom 2030 Fund                                                                        2,980,369         2,198,563
             Freedom 2040 Fund                                                                          809,797           508,701
             Freedom Income Fund                                                                        811,008           817,014
             PIMCO Total Return Fund: Class ADM                                                      18,431,355        19,075,530

          Common Collective Trusts:
             Managed Income Portfolio II: Class II*                                                  74,567,391        80,699,253
             U.S. Equity Index Commingled Pool                                                                -        23,610,546

          Common Stock:
             Thermo Electron Corporation, 480,417 and 533,692 shares, respectively                   14,503,789        13,449,038

          Cash                                                                                          716,932           632,382
                                                                                                   ------------      ------------

                Total investments                                                                  $440,863,541      $427,399,405
                                                                                                   ============      ============

        *Investments that represent five percent or more of the Plan's net assets.



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Thermo Electron Corporation Choice Plan
Notes to Financial Statements
December 31, 2004 and 2003
--------------------------------------------------------------------------------

4.      Investments (continued)

        During 2004, the Plan's investments (including investments bought, sold
        and held during the year) appreciated in value by $33,116,814, as
        follows:

                                                                 Year Ended
                                                             December 31, 2004
                                                             -----------------

          Mutual funds                                          $30,021,043
          Common collective trusts                                  558,639
          Common stock                                            2,537,132
                                                                -----------

          Net change in fair value                              $33,116,814
                                                                ===========

5.      Related-party Transactions

        Certain Plan investments are managed by the Fidelity Management Trust
        Company (Fidelity), which is a trustee as defined by the Plan.
        Therefore, transactions in these investments qualify as
        party-in-interest transactions. There were no fees paid by the Plan for
        investment management services for the period ended December 31, 2004.
        However, there were administrative expenses paid by the Plan to Fidelity
        in the amount of $37,258. These transactions, as well as participant
        loans, qualify as party-in-interest transactions.

        The Plan invests in common stock of the Company and transactions in this
        common stock are related-party transactions. In 2004, the Plan purchased
        shares of Company common stock on the open market having a value of
        $152,093. In 2004 and 2003, the Plan sold shares of Company common stock
        on the open market having values of $1,256,619 and $793,012,
        respectively.

6.      Plan Termination

        Although it has not expressed an intent to do so, the Company has the
        right under the Plan to discontinue its contributions at any time and to
        terminate the Plan, subject to the provisions of ERISA. In the event of
        Plan termination, participants would become 100% vested in their
        employer contributions.

7.      Administrative Expenses

        The Company pays the majority of administrative expenses associated with
        management of and professional services for the Plan. Administrative
        fees for hardship withdrawals and loan transactions are paid by the
        participants, and are included in the statement of changes in net assets
        available for benefits. During 2004, the Company received a settlement
        of approximately $53,000 from the prior recordkeeper for the Plan. The
        proceeds from the settlement were utilized to offset administrative
        expenses.



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Thermo Electron Corporation Choice Plan
Schedule H, Line 4i
Schedule of Assets (Held at End of Year)
December 31, 2004 
--------------------------------------------------------------------------------



                                                                                                              

                                                                                                             Supplemental Schedule
----------------------------------------------------------------------------------------------------------------------------------

Identity of Issue/Borrower,             Description of investments including maturity date,                                Current
Lessor or Similar Party                 rate of interest, collateral, par, or maturity value              Cost               Value
----------------------------------------------------------------------------------------------------------------------------------

Common Collective Trust
 Fidelity                               Managed Income Portfolio II: Class II (1)                          (2)        $ 74,567,391
                                                                                                                      ------------

Mutual Funds
 Dodge and Cox                          Dodge and Cox Stock Fund                                           (2)          83,953,751
 Fidelity                               Balanced Fund (1)                                                  (2)          53,653,572
 Fidelity                               Blue Chip Growth Fund (1)                                          (2)          48,564,525
 Fidelity                               Growth Company Fund (1)                                            (2)          33,206,584
 Fidelity                               Diversified International Fund (1)                                 (2)          32,820,890
 Fidelity                               Freedom 2000 Fund (1)                                              (2)             568,472
 Fidelity                               Freedom 2010 Fund (1)                                              (2)           1,930,488
 Fidelity                               Freedom 2020 Fund (1)                                              (2)           4,011,945
 Fidelity                               Freedom 2030 Fund (1)                                              (2)           2,980,369
 Fidelity                               Freedom 2040 Fund (1)                                              (2)             809,797
 Fidelity                               Freedom Income Fund (1)                                            (2)             811,008
 Fidelity                               Spartan U.S. Equity Index Fund (1)                                 (2)          46,959,389
 PIMCO                                  Total Return Fund: Class ADM                                       (2)          18,431,355
 T. Rowe Price                          Small-Cap Stock Fund, Inc.                                         (2)          22,373,284
                                                                                                                       ------------

                                           Total mutual funds                                                          351,075,429
                                                                                                                      ------------

 Thermo Electron Corporation            Common Stock Fund (1)                                              (2)          14,503,789
                                        Cash                                                                               716,932
                                                                                                                      ------------

                                           Total Thermo Electron Corporation Stock Fund                                 15,220,721
                                                                                                                      ------------

 Participants                           Participant loans (for a term not exceeding 30 years
                                         at interest rates ranging from 5% to 10.75%) (1)                  (2)           4,753,201
                                                                                                                      ------------

                                           Total                                                                      $445,616,742
                                                                                                                      ============

(1) All investments are a party in interest to the Plan.
(2) Cost information is not required for participant directed investments and, therefore, is not included.



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Thermo Electron Corporation Choice Plan
Exhibit Index
December 31, 2004 and 2003
--------------------------------------------------------------------------------

Exhibit
Number            Description of Exhibit
--------------------------------------------------------------------------------

23.1              Consent of PricewaterhouseCoopers LLP.



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