United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Bel Fuse Inc. - Class B (Name of Issuer) Common Stock (Title of Class of Securities) 077347300 (CUSIP number) 12/31/2003 (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 that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes.) CUSIP No. 077347300 1 - NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Eaton Vance Management 2 - CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) Group Disclaimed _X_ 3 - SEC USE ONLY 4 - CITIZENSHIP OR PLACE OF ORGANIZATION Boston, MA NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 5 - SOLE VOTING POWER 285,205 Shares 6 - SHARED VOTING POWER 0 Shares 7 - SOLE DISPOSITIVE POWER 285,205 Shares 8 - SHARED DISPOSITIVE POWER 0 Shares 9 - AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 285,205 Shares 10 - CHECK IF THE AGGREGATE AMOUNT ON ROW (9) EXCLUDES CERTAIN SHARES 11 - PERCENT OF CLASS REPRESENTED BY AMOUNT ON ROW 9 3.38% 12 - TYPE OF REPORTING PERSON IA CUSIP No. 077347300 Item 1(a) Name of Issuer: Bel Fuse Inc. - Class B Item 1(b) Address of Issuer's Principal Executive Office: 206 Van Vorst Street Jersey City, NJ 07302 Item 2(a) Name of Person Filing: Eaton Vance Management Item 2(b) Address of Principal Business Office of Person Filing: 255 State Street Boston, MA 02109 Item 2(c) Citizenship: United States Item 2(d) Title of Class of Securities: Common Stock Item 2(e) CUSIP Number: 077347300 Item 3 Eligibility to File Schedule 13G: Eaton Vance Management is an investment adviser in accordance with S240.13d- 1(b)(1)(ii)(E). Item 4 Ownership: (a) Amount beneficially owned: 285,205 shares (b) Percent of class: 3.38% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 285,205 shares. (ii) Shared power to vote or to direct the vote 0 shares. (iii) Sole power to dispose or to direct the disposition of 285,205 shares. (iv) Shared power to dispose or to direct the disposition of 0 shares. Item 5 Ownership of Five Percent or Less of a Class: Eaton Vance Management, as of the date hereof, has ceased to be the beneficial owner of more than five percent of Bel Fuse Inc. - Class B. Item 6 Ownership of More than Five Percent on Behalf of Another Person: Not applicable 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: CERTIFICATION AND SIGNATURE Eaton Vance Management certifies that it is a person entitled to file statements on Schedule 13G under Rule 13d-1(b)(1) promulgated under the Securities Exchange Act of 1934, and the security referred to above was acquired in the ordinary course of business and was not acquired for the purpose of and do not have the effect of changing or influencing control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect. After reasonable inquiry and to the best of its knowledge and belief, Eaton Vance Management certifies that the information set forth in this Amendment is true, complete and correct. EATON VANCE MANAGEMENT By: /s/Michelle A. Alexander (Signature) Michelle A. Alexander, Vice President /s/February 12, 2004 (Date)