UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 4)*

                              SPECTRUM CONTROL INC.
        -----------------------------------------------------------------
                                (Name of Issuer)

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

                                    847615101
                              --------------------
                                 (CUSIP Number)

                                December 31, 2004
        ----------------------------------------------------------------
             (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 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 ("Act") or otherwise  subject to the  liabilities of the section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





                                 SCHEDULE 13G/A
                               CUSIP NO. 847615101



1.      Names of Reporting Persons.
        I.R.S. Identification Nos. of above persons (entities only).

        Quaker Capital Management Corporation
        ------------------------------------------------------------------------

2.      Check the Appropriate Box if a Member of a Group

        (a)
                  ------
        (b)        X
                  ------

3.      SEC Use Only
                                   ---------------------------------------------

4.      Citizenship or Place of Organization                        Pennsylvania
                                                                 ---------------

Number of         5.       Sole Voting Power                           1,026,600
  Shares                                                         ---------------
Beneficially      6.       Shared Voting Power                           632,050
  Owned by                                                       ---------------
Each Reporting    7.       Sole Dispositive Power                      1,026,600
    Person                                                       ---------------
         With:    8.       Shared Dispositive Power                      632,050
                                                                 ---------------

9.      Aggregate Amount Beneficially Owned by Each Reporting Person

        1,658,650
        ----------------

10.     Check if the Aggregate Amount in Row (9) Excludes Certain Shares
                                                
                        --------
        The  Reporting Person disclaims beneficial ownership of 1,626,950 shares
        owned by its clients.

11.     Percent of Class Represented by Amount in Row (9)

                                                                       12.73%
                                                                      --------

12.     Type of Reporting Person                                          IA
                                                                  --------------


                               Page 2 of 6 Pages



                                 SCHEDULE 13G/A
                               CUSIP NO. 847615101

Item 1.

         (a)      Name of Issuer

                  SPECTRUM CONTROL INC.
                  --------------------------------------------------------------

         (b)      Address of Issuer's Principal Executive Offices

                  8031 Avonia Road, Fairview, Pennsylvania 16415
                  --------------------------------------------------------------
Item 2.

         (a)      Name of Persons Filing

                  Quaker Capital Management Corporation
                  --------------------------------------------------------------

         (b)      Address of Principal Business Office or, if none, Residence

                  401 Wood Street, Suite 1300, Pittsburgh, PA  15222
                  --------------------------------------------------------------

         (c)      Citizenship

                  Pennsylvania, USA
                  --------------------------------------------------------------

         (d)      Title of Class of Securities

                  Common Stock
                  --------------------------------------------------------------

         (e)      CUSIP Number

                  847615101
                  --------------------------------------------------------------


                               Page 3 of 6 Pages



                                 SCHEDULE 13G/A
                               CUSIP NO. 847615101

Item 3.      If this statement  is  filed  pursuant   to   ss.ss.240.13d-1(b) or
             240.13d-2(b) or (c), check whether the person filing is a:

     (a)     /   / Broker of dealer  registered  under section 15 of the Act;

     (b)     /   / Bank as defined in section 3(a)(6) of the Act;

     (c)     /   / Insurance  company as defined in section 3(a)(19) of the Act;

     (d)     /   / Investment   company  registered   under section  8  of   the
                   Investment Company Act of 1940;

     (e)     / X / An  investment  adviser  in  accordance  with    ss.240.13d-
                    1(b)(l)(ii)(E);

     (f)     /   / An employee  benefit  plan or  endowment  fund in  accordance
                   with ss.240.13d-1(b)(1)(ii)(F);

     (g)     /   / A parent  holding  company or  control  person in
                           accordance with ss.240.13d-1(b)(1)(ii)(G);

     (h)     /   / A savings  association as defined in  Section  3(b)  of   the
                   Federal Deposit Insurance Act;

     (i)     /   / A  church  plan  that  is  excluded   from  the    definition
                   of an  investment  company  under section     3(c)(14) of the
                   Investment Company Act of 1940;

     (j)    /   /  Group, in  accordance  with ss.240.13d-1((b)(l)(ii)(J)

Item 4.  Ownership
         ---------

         (a)      The Reporting Person,  in its capacity as investment  adviser,
                  may be deemed to be the beneficial  owner of 1,626,950  shares
                  of the Common  Stock of the Issuer  which are owned by various
                  investment   advisory  clients  of  the  Reporting  Person  in
                  accounts  over which the  Reporting  Person has  discretionary
                  authority. The filing of this report shall not be construed as
                  an  admission  that the  Reporting  Person is, for purposes of
                  Section  13(d) or 13(g) of the Act,  the  beneficial  owner of
                  these  securities.  Additionally,  the Reporting Person and/or
                  its  principals  and employees own 31,700 shares of the Common
                  Stock of the Issuer.

                               Page 4 of 6 Pages


                                 SCHEDULE 13G/A
                               CUSIP NO. 847615101

         (b)      The shares  covered  by this  report  represent  12.73% of the
                  Common Stock of the Issuer.

         (c)      The Reporting  Person has shared voting and dispositive  power
                  over 632,050 shares and sole voting and dispositive power over
                  994,900  shares  owned  by  its  clients  and held in accounts
                  over  which  it has  discretionary  authority.  The  Reporting
                  Person and/or its  principals  and employees  have sole voting
                  and  dispositive  power  over the 31,700  shares  owned by the
                  Reporting Person and/or its principals and employees.

Item 5.  Ownership of Five Percent or Less of a Class

                  If this statement is being filed to report the fact that as of
the date hereof,  the reporting  person has ceased to be the beneficial owner of
more than five percent of the class of securities, check the following:

                                                                      ----------

Item 6.  Ownership of More than Five Percent on Behalf of Another Person

                  1,626,950  of the shares with  respect to which this report is
filed are owned by a variety of  investment  advisory  clients of the  Reporting
Person, which clients are entitled to receive dividends on and the proceeds from
the sale of such shares. No client is known to own more than 5% of the class.

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.



                               Page 5 of 6 Pages


                                 SCHEDULE 13G/A
                               CUSIP NO. 847615101


                                    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.


                                           QUAKER CAPITAL MANAGEMENT CORPORATION


                                                February 9, 2005                
                                                --------------------------------
                                                           Date


                                                /s/ Mark G. Schoeppner          
                                                --------------------------------
                                                          Signature


                                                Mark G. Schoeppner, President   
                                                --------------------------------
                                                          Name/Title


                               Page 6 of 6 Pages