SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            -------------------------

                                  SCHEDULE 13G
                                 (Rule 13d-102)

                    INFORMATION TO BE INCLUDED IN STATEMENTS
                  FILED PURSUANT TO RULES 13d-1(b), (c) AND (d)
                AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b)
                        (Amendment No. ______3______)(1)


                                    CSP INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)



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



                                    126389105
--------------------------------------------------------------------------------
                                 (CUSIP NUMBER)


                                December 31, 2006
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


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

                                / / Rule 13d-1(b)
                                /X/ Rule 13d-1(c)
                                / / Rule 13d-1(d)



___________________________

(1)  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 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  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).






--------------------------------------------------------------------------------
     NAME OF REPORTING PERSONS: Daniel Zeff
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

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

                                                                   (a)       X
                                                                   (b)
--------------------------------------------------------------------------------
     SEC USE ONLY

--------------------------------------------------------------------------------
     CITIZENSHIP OR PLACE OF ORGANIZATION        United States of America

--------------------------------------------------------------------------------
 NUMBER OF             SOLE VOTING POWER                           324,703
  SHARES
BENEFICIALLY
  OWNED BY
    EACH
  REPORTING
 PERSON WITH
--------------------------------------------------------------------------------
                       SHARED VOTING POWER                         0

--------------------------------------------------------------------------------
                       SOLE DISPOSITIVE POWER                      324,703

--------------------------------------------------------------------------------
                       SHARED DISPOSITIVE POWER                    0

--------------------------------------------------------------------------------
     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  324,703


--------------------------------------------------------------------------------
     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES*
--------------------------------------------------------------------------------
     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)             8.8%

--------------------------------------------------------------------------------
     TYPE OF REPORTING PERSON*                                     IN

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



                                     - 2 -





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      NAME OF REPORTING PERSONS: Spectrum Galaxy Fund Ltd.
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

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

                                                                   (a)       X
                                                                   (b)
--------------------------------------------------------------------------------
     SEC USE ONLY

--------------------------------------------------------------------------------
     CITIZENSHIP OR PLACE OF ORGANIZATION        British Virgin Islands

--------------------------------------------------------------------------------
 NUMBER OF             SOLE VOTING POWER                           166,619
  SHARES
BENEFICIALLY
  OWNED BY
    EACH
  REPORTING
 PERSON WITH
--------------------------------------------------------------------------------
                       SHARED VOTING POWER                         0

--------------------------------------------------------------------------------
                       SOLE DISPOSITIVE POWER                      166,619

--------------------------------------------------------------------------------
                       SHARED DISPOSITIVE POWER                    0

--------------------------------------------------------------------------------
     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  166,619


--------------------------------------------------------------------------------
     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES*
--------------------------------------------------------------------------------
     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)             4.5%

--------------------------------------------------------------------------------
     TYPE OF REPORTING PERSON*                                     CO

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



                                     - 3 -




--------------------------------------------------------------------------------
    NAME OF REPORTING PERSONS: Zeff Capital Partners I, L.P.
    I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

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

                                                                   (a)       X
                                                                   (b)
--------------------------------------------------------------------------------
     SEC USE ONLY

--------------------------------------------------------------------------------
     CITIZENSHIP OR PLACE OF ORGANIZATION        Delaware

--------------------------------------------------------------------------------
 NUMBER OF             SOLE VOTING POWER                           158,084
  SHARES
BENEFICIALLY
  OWNED BY
    EACH
  REPORTING
 PERSON WITH
--------------------------------------------------------------------------------
                       SHARED VOTING POWER                         0

--------------------------------------------------------------------------------
                       SOLE DISPOSITIVE POWER                      158,084

--------------------------------------------------------------------------------
                       SHARED DISPOSITIVE POWER                    0

--------------------------------------------------------------------------------
     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  158,084


--------------------------------------------------------------------------------
     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES*
--------------------------------------------------------------------------------
     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)             4.3%

--------------------------------------------------------------------------------
     TYPE OF REPORTING PERSON*                                     PN
--------------------------------------------------------------------------------


                                     - 4 -





--------------------------------------------------------------------------------
     NAME OF REPORTING PERSONS: Zeff Holding Company, LLC
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

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

                                                                   (a)       X
                                                                   (b)
--------------------------------------------------------------------------------
     SEC USE ONLY

--------------------------------------------------------------------------------
     CITIZENSHIP OR PLACE OF ORGANIZATION        Delaware

--------------------------------------------------------------------------------
 NUMBER OF             SOLE VOTING POWER                           158,084
  SHARES
BENEFICIALLY
  OWNED BY
    EACH
  REPORTING
 PERSON WITH
--------------------------------------------------------------------------------
                       SHARED VOTING POWER                         0

--------------------------------------------------------------------------------
                       SOLE DISPOSITIVE POWER                      158,084

--------------------------------------------------------------------------------
                       SHARED DISPOSITIVE POWER                    0

--------------------------------------------------------------------------------
     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  158,084


--------------------------------------------------------------------------------
     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
     CERTAIN SHARES*
--------------------------------------------------------------------------------
     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)             4.3%

--------------------------------------------------------------------------------
     TYPE OF REPORTING PERSON*                                     OO
--------------------------------------------------------------------------------


                                     - 5 -





Item 1(a).        Name of Issuer:

                           CSP INC.

Item 1(b).        Address of Issuer's Principal Executive Offices:

                           43 Manning Road
                           Billerica, MA 01821-3901

Item 2(a).        Name of Person Filing:

                           This statement is filed as a joint statement pursuant
                           to Rule 13d-1(k) promulgated under the Securities
                           Exchange Act of 1934 (the "Exchange Act") by Zeff
                           Capital Partners, I, L.P., a Delaware limited
                           partnership ("Capital"), Zeff Holding Company, LLC, a
                           Delaware limited liability company ("Holding"),
                           Spectrum Galaxy Fund Ltd., a company incorporated in
                           the British Virgin Islands ("Spectrum") and Daniel
                           Zeff, an individual ("Zeff") (Capital, Holding,
                           Spectrum and Zeff are hereinafter collectively
                           referred to as the "Reporting Persons"). Zeff
                           provides discretionary investment management services
                           to Zeff Capital Offshore Fund, a class of shares of
                           Spectrum. Zeff is the sole manager and member of
                           Holding, which in turn serves as the general partner
                           for Capital. Accordingly, the Reporting Persons are
                           making a group filing because, due to the
                           relationship between them, the Reporting Persons may
                           be deemed to constitute a "group" for the purposes of
                           Section 13(d)(3) of the Exchange Act.

Item 2(b).        Address of Principal Business Office or, if None, Residence:

                           The address of the principal place of business and
                           principal office of each of the Reporting Persons is:

                           50 California Street, Suite 1500
                           San Francisco, CA 94111
Item 2(c).        Citizenship:

                           Zeff is a United States citizen. Spectrum is
                           organized under the laws of the British Virgin
                           Islands. Capital and Holding are organized under the
                           laws of the State of Delaware.

Item 2(d).        Title of Class of Securities:

                           Common Stock, $0.01 par value

Item 2(e).        CUSIP Number:

                           126389105



                                     - 6 -




Item 3. If this  statement is filed  pursuant to Rule  13d-1(b),  or 13d-2(b) or
        (c), check whether the person filing is a: Not Applicable

          (a)  [ ] Broker or dealer  registered under Section 15 of the Exchange
               Act;

          (b)  [ ] Bank as defined in Section 3(a)(6) of the Exchange Act;

          (c)  [ ]  Insurance  Company as defined  in  Section  3(a)(19)  of the
               Exchange Act;

          (d)  [ ]  Investment  Company  registered  under  Section  8  of  the
               Investment Company Exchange Act;

          (e)  [ ]    Investment    Adviser    in    accordance    with   Rule
               13d-1(b)(1)(ii)(E);

          (f)  [ ] Employee  Benefit Plan or Endowment  Fund in accordance  with
               Rule 13d-1(b)(1)(ii)(F);

          (g)  [ ] Parent Holding  Company or Control Person in accordance  with
               Rule 13d-1(b)(1)(ii)(G);

          (h)  [ ] Saving  Association as defined in Section 3(b) of The Federal
               Deposit Insurance Act;

          (i)  [ ]  Church  Plan  that is  excluded  from the  definition  of an
               Investment  Company  under  Section  3(c)(14)  of the  Investment
               Company Act;

          (j)  [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).




                                                                                                          

Item 4.  Ownership.

A.  Daniel Zeff
    -----------

(a)  Amount beneficially owned:                                                                              324,703
(b)  Percent of Class:                                                                                          8.8%
(c)   Number of shares as to which such person has:
            (i)        Sole power to vote or direct the vote:                                                324,703
            (ii)       Shared power to vote or to direct the vote:                                                 0
            (iii)      Sole power to dispose or direct the disposition of:                                   324,703
            (iv)       Shared power to dispose or to direct the disposition of:                                    0


B.  Spectrum
    --------

(a)  Amount beneficially owned:                                                                             166,619
(b)  Percent of Class:                                                                                         4.5%
(c)   Number of shares as to which such person has:
            (i)            Sole power to vote or direct the vote:                                           166,619
            (ii)           Shared power to vote or to direct the vote:                                            0




                                     - 7 -


            (iii)          Sole power to dispose or direct the disposition of:                              166,619
            (iv)           Shared power to dispose or to direct the disposition of:                               0


C.  Capital
    -------

(a)  Amount beneficially owned:                                                                             158,084
(b)  Percent of Class:                                                                                         4.3%
(c)   Number of shares as to which such person has:
            (i)            Sole power to vote or direct the vote:                                           158,084
            (ii)           Shared power to vote or to direct the vote:                                            0
            (iii)          Sole power to dispose or direct the disposition of:                              158,084
            (iv)           Shared power to dispose or to direct the disposition of:                               0


D.  Holding
    -------

(a)  Amount beneficially owned:                                                                             158,084
(b)  Percent of Class:                                                                                         4.3%
(c)   Number of shares as to which such person has:
            (i)            Sole power to vote or direct the vote:                                           158,084
            (ii)           Shared power to vote or to direct the vote:                                            0
            (iii)          Sole power to dispose or direct the disposition of:                              158,084
            (iv)           Shared power to dispose or to direct the disposition of:                               0


                                    As calculated in accordance with Rule 13d-3
                           of the Exchange Act, Zeff beneficially owns 324,703
                           shares of the Issuer's Common Stock, representing
                           8.8% of the Common Stock. Zeff does not directly own
                           any shares of Common Stock. Zeff's beneficial
                           ownership is comprised of 158,084 shares of Common
                           Stock held by Capital and 166,619 shares of Common
                           Stock held by Spectrum. Zeff beneficially owns the
                           shares of Common Stock held by Capital in his
                           capacity as the sole manager and member of Holding,
                           which in turn serves as the general partner Capital.
                           Zeff beneficially owns the shares of Common Stock
                           held by Spectrum in his capacity as investment
                           manager to Zeff Capital Offshore Fund, a class of
                           shares of Spectrum.



                                     - 8 -





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.

                     Capital has the right to receive and the power to
                     direct the receipt of dividends from, and the
                     proceeds from the sale of, the 158,084 shares of
                     Common Stock held by it, which power is exercisable
                     by Mr. Zeff as sole manager of Holding, Capital's
                     general partner.

                     Spectrum has the sole power to receive and to direct
                     the receipt of dividends from, and the proceeds from
                     the sale of, the 166,619 shares of Common Stock held
                     by it, which power is exercisable by Mr. Zeff as
                     investment manager.

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.

                     Please see Exhibit 1, Joint Filing Agreement.

Item 9.     Notice of Dissolution of Group.

                     Not Applicable


                                     - 9 -




Item 10. Certification.

     By signing  below I certify  that,  to the best of my knowledge and belief,
the  securities  referred  to above 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 13, 2007           /s/ Daniel Zeff
                                   ----------------------------------
                                   Daniel Zeff


                                   ZEFF HOLDING COMPANY, LLC

                                   By: /s/ Daniel Zeff
                                   ----------------------------------
                                   Name: Daniel Zeff
                                   Title: Manager


                                   ZEFF CAPITAL PARTNERS I, L.P.
                                   By: Zeff Holding Company, LLC,
                                   as general partner

                                   By: /s/ Daniel Zeff
                                   ----------------------------------
                                   Name: Daniel Zeff
                                   Title: Manager


                                   SPECTRUM GALAXY FUND LTD.

                                   By: /s/ Dion R. Friedland
                                   ----------------------------------
                                   Name: Dion R. Friedland
                                   Title: Director


     Attention:  Intentional  misstatements  or  omissions  of  fact  constitute
Federal criminal violations (see 18 U.S.C. 1001).



                                     - 10 -




                                                                   Exhibit 1



                             Joint Filing Agreement



     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934,
as amended,  the undersigned  hereby agree to the joint filing on behalf of each
of them of a statement  on Schedule  13G  (including  amendments  thereto)  with
respect to the Common Stock of CSP INC.,  and that this Agreement be included as
an Exhibit to such joint filing. This Agreement may be executed in any number of
counterparts  all of which  taken  together  shall  constitute  one and the same
instrument.

In witness hereof, the undersigned hereby executed this Agreement this 13 day of
February, 2007.



                                   /s/ Daniel Zeff
                                   ----------------------------------
                                   Daniel Zeff


                                   ZEFF HOLDING COMPANY, LLC

                                   By: /s/ Daniel Zeff
                                   ----------------------------------
                                   Name: Daniel Zeff
                                   Title: Manager


                                   ZEFF CAPITAL PARTNERS I, L.P.
                                   By: Zeff Holding Company, LLC,
                                   as general partner

                                   By: /s/ Daniel Zeff
                                   ----------------------------------
                                   Name: Daniel Zeff
                                   Title: Manager


                                   SPECTRUM GALAXY FUND LTD.

                                   By: /s/ Dion R. Friedland
                                   ----------------------------------
                                   Name: Dion R. Friedland
                                   Title: Director



                                     - 11 -