WARBURG PINCUS ASSET MANAGEMENT INC
SC 13G/A, 1999-02-09
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934

                          (Amendment No. _____2____)*

                           Aavid Thermal Technologies
                           --------------------------
                                (Name of Issuer)

                                  Common Stock
                                  ------------
                         (Title of Class of Securities)

                                    00253910
                                    --------
                                 (CUSIP Number)

                                January 29, 1999
                                ----------------
            (Date of Event Which Requires Filing of this Statement)

          Check the appropriate box to designate the rule pursuant to
                         which this Schedule is filed:

                           [X] Rule 13d-1(b
                           [ ] Rule 13d-1(c)
                           [ ] Rule 13d-1(d)

 *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  on 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 ("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 of 4 Pages

<PAGE>




- --------------------                                         -------------------
CUSIP No.  00253910                    13G                    Page 2 of 4 Pages
- --------------------                                         -------------------

- ---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Warburg Pincus Asset Management, Inc.                    13-2673503
- ---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                    (a) [ ]

                                                                    (b) [ ]
           Not applicable
- ---------- ---------------------------------------------------------------------
        3  SEC USE ONLY

- ---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
- -------------------- ------ ----------------------------------------------------
                        5  SOLE VOTING POWER

                            224,100
                     ------ ----------------------------------------------------
     NUMBER OF           6  SHARED VOTING POWER
      SHARES
   BENEFICIALLY             758,180
     OWNED BY
                     ------ ----------------------------------------------------
       EACH              7  SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                1,025,134
       WITH
                     ------ ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            0
- ---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,025,134
- ---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           (SEE INSTRUCTIONS)
           [  ]
           Not applicable
- ---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.11%
- ---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
           IA

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


<PAGE>


Item 1(a):     Name of Issuer:
- ----------     ---------------
               Aavid Thermal Technologies

Item 1(b):     Address of Issuer's Principal Executive Offices:
- ----------     ------------------------------------------------
               One Eagle Square
               Suite 509
               Concord, NH  03301

Item 2(a)      Name of Person Filing
- ---------      ---------------------
               Warburg Pincus Asset Management, Inc.

Item 2(b):     Address of Principal Business Office:
- ----------     -------------------------------------
               466 Lexington Avenue, New York, New York 10017

Item 2(c):     Citizenship:
- ----------     ------------
               Delaware

Item 2(d):     Title of Class of Securities:
- ----------     -----------------------------
               Common Stock

Item 2(e):     CUSIP Number:
- ----------     -------------
               00253910

Item 3:        If the reporting person is an investment adviser in accordance
- -------        with ss. 240.13d-1(b)(1)(ii)(E), check this box.  [X]

Item 4:        Ownership:
- -------        ----------
               (a) Amount beneficially owned:   1,025,134.

               (b) Percent of class:    11.11%.

               (c) Number of shares as to which the  person has:

                   (i)   Sole power to vote or to direct the vote 224,100.

                   (ii)  Shared power to vote or to direct the vote 758,180.

                   (iii) Sole power to dispose or to direct the disposition of
                         1,025,134.

                   (iv)  Shared power to dispose or to direct the disposition
                         of 0.


Item 5:        Ownership of Five Percent or Less of a Class:
- -------        ---------------------------------------------
               Not Applicable




                                Page 3 of 4 Pages

<PAGE>


Item 6:        Ownership of More than Five Percent on Behalf of Another Person:
- -------        ----------------------------------------------------------------
               Warburg Pincus Asset Management, Inc. ("WPAM") is an Investment
               Adviser registered with the United States Securities and Exchange
               Commission. WPAM serves as investment adviser to many accounts
               including various registered investment companies. The securities
               which are the subject of this report are owned by our accounts.
               In this report no account owned more than 5%.

Item 7:        Identification and Classification of the
- -------        ----------------------------------------
               Subsidiary Which Acquired the Security Being
               --------------------------------------------
               Reported on By the Parent Holding Company:
               ------------------------------------------
               Not Applicable.

Item 8:        Identification and Classification of 
- -------        ------------------------------------ 
               Members of the Group:
               ---------------------
               Not Applicable.

Item 9:        Notice of Dissolution of Group:
- -------        -------------------------------
               Not Applicable.

Item 10:       Certification:
- --------       --------------

               By signing below I certify that, to the best of my knowledge and
               belief, the securities referred to above were acquired and are
               held in the ordinary course of business and were not acquired and
               are not held for the purpose of or with the effect of changing or
               influencing the control of the issuer of the securities and were
               not acquired and are not held in connection with or as a
               participant in any transaction having that purpose or effect.



                                    SIGNATURE
                                    ---------

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated:  February 4, 1999



                                    By: /s/ Linda S. Iovan
                                       ----------------------
                                       Name:  Linda S. Iovan
                                       Title: Vice President







                                Page 4 of 4 Pages



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