SI DIAMOND TECHNOLOGY INC
SC 13D, 1997-01-31
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                 SCHEDULE 13D


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (AMENDMENT NO. 1)*
 
 
                         SI Diamond Technology, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)
 
 
                        Common Stock, $.001 par value
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)
 
 
                                   784249104
          ------------------------------------------------------------          
                                (CUSIP Number)
 
 
                              Charles H. Winkler
                          Citadel Limited Partnership
                          225 West Washington Street
                                   Suite 900
                               Chicago, IL 60606
                                (312) 696-2102
- --------------------------------------------------------------------------------
  (Name, Address and Telephone Number of Person Authorized to Receive Notices
                              and Communications)
 
 
                               January 23, 1997
          ------------------------------------------------------------          
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

*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 ("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 5 Pages
<PAGE>
 
                                 SCHEDULE 13D

CUSIP No. 784249104

 
             1               NAME OF REPORTING PERSON
                             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                               Citadel Limited Partnership
                               FEIN No.:  36-3754834
 
             2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                               (A) [ ]
                               (B) [ ]
 
             3               SEC USE ONLY
 
 
             4               SOURCE OF FUNDS*
                               AF
 
             5               CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                             REQUIRED PURSUANT TO ITEMS 2(d) or 2(E)   [ ]
 
             6               CITIZENSHIP OR PLACE OF ORGANIZATION
                               U.S.
 
     NUMBER OF SHARES          7  SOLE VOTING POWER
   BENEFICIALLY OWNED BY            Reporting person has voting and dispositive
 EACH REPORTING PERSON WITH         power over (i) shares of Series E Preferred
                                    Stock which, as of the date for the filing
                                    of this statement, are convertible into
                                    676,266 shares of Common Stock and (ii)
                                    11,254 shares of Common Stock.
 
                               8  SHARED VOTING POWER
                                    -0-
 
                               9  SOLE DISPOSITIVE POWER
                                    See item 7 above.
 
                              10  SHARED DISPOSITIVE POWER
                                    -0-
 
            11               AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
                             REPORTING PERSON
                               See item 7 above.
 
            12               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
                             EXCLUDES CERTAIN SHARES*   [ ]
 
            13               PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                               4.9% as of the date for the filing of this
                               statement. (Based on 13,125,083 shares of Common
                               Stock issued and outstanding as of November 12,
                               1996, plus the Common Stock referred to in item 7
                               above.)
 
            14               TYPE OF REPORTING PERSON*
                               PN


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                     INCLUDE BOTH SIDES OF THE COVER PAGE,
                            RESPONSES TO ITEMS 1-7
                   (INCLUDING EXHIBITS) OF THE SCHEDULE, AND
                          THE SIGNATURE ATTESTATION.

                                                               Page 2 of 5 Pages
<PAGE>
 
          This is the second amendment to the Schedule 13D previously filed by
the reporting person with respect to the securities of the issuer set forth on
the cover page hereto (such initial filing, together with any prior amendments
thereto, the "Prior Filing").  This amendment is being filed in order to amend
and restate Item 5 of the Prior Filing in its entirety in connection with an
agreement between the issuer and affiliates of the reporting person.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

     (a)  By reason of its serving as managing general partner of Nelson and
          trading manager of Olympus, Citadel may be deemed to be the indirect
          beneficial owner of (i) the Convertible Securities and the shares of
          Common Stock into which the Convertible Securities are convertible and
          (ii) the Common Stock, in each case, held by Nelson and Olympus.  As
          of the date for the filing of this statement, Nelson and Olympus
          collectively own Convertible Securities for which they originally paid
          $2,720,000 ("Stated Value") and 11,254 shares of Common Stock.

          As previously reported, as of any date ("Conversion Date") all or a
          portion of the Convertible Securities may be converted into the number
          of shares of Common Stock determined by dividing  the Stated Value of
          such securities (plus an amount equal to 8% interest on the Stated
          Value of such securities from the Funding Date) by a conversion price
          ("Conversion Price").  The Conversion Price is equal to the lesser of
          (i) $3.00 (the "Fixed Conversion Price") and (ii) 85% of the average
          closing bid  price (as reported by NASDAQ or such other market or
          exchange as the Common Stock is then traded) of the Issuer's Common
          Stock for the five trading days immediately preceding the Conversion
          Date.

          If the Company's Common Stock is trading at a price less than $3.53,
          the Conversion Price will fluctuate depending upon the closing bid
          price of the Issuer's Common Stock.  As a consequence, the number of
          shares of Common Stock into which the Convertible Securities may be
          converted, and consequently the number of shares of such securities
          which Citadel may be deemed to beneficially own, may fluctuate on a
          daily basis based solely on the Common Stock's market price and
          without any action taken by Citadel, Nelson or Olympus.

          As of the date for the filing of this statement, the Issuer announced
          an agreement by and among the Issuer, Nelson, Olympus and other
          holders of convertible securities of the Issuer amending the terms of
          the Convertible Securities.  Among other things, the agreement
          provides that the Fixed Conversion Price shall be $1.875 for one-third
          of the Convertible Securities held by Nelson and Olympus as of the
          date of the agreement.  The remaining Convertible Securities shall
          retain a Fixed Conversion Price of $3.00, subject to reduction upon
          certain events.  In addition, the agreement restricts the amount of
          Convertible Securities that may be converted as of any date to an
          amount that would not exceed 4.9% of the Common Stock then
          outstanding.  The agreement also provides for other restrictions on
          the convertibility of the Convertible Securities.

          By virtue of the foregoing agreement and its status as the managing
          general partner of Nelson and the trading manager for Olympus, Citadel
          may never be deemed to be the beneficial owner of more than 4.9% of
          the Common Stock, which as of the date for the filing of this
          statement equals 676,266 (based on (i) 13,125,083 shares of Common
          Stock issued and outstanding as set forth in the Issuer's most
          recently filed 10-QSB and (ii) a Conversion Price equal to $1.5194).

     (b)  Citadel has the sole power to vote and the sole power to dispose of
          the Convertible Securities, the Common Stock into which the
          Convertible Securities are convertible and the Common Stock held by
          Nelson and Olympus on behalf of each of Nelson and Olympus.

     (c)  The following transactions with respect to the Issuer's common stock
          have been effected during the 60-day period ending January 22, 1997:

<TABLE>
<CAPTION>
Transaction Date     Transacting Party  Transaction  Quantity  Price
- -------------------  -----------------  -----------  --------  -----
<S>                  <C>                <C>          <C>       <C>
November 26, 1996    Nelson             Sell           20,000   2.13
November 26, 1996    Olympus            Sell           20,000   2.13
November 27, 1996    Nelson             Sell           17,500   2.14
November 27, 1996    Olympus            Sell           17,500   2.14
December 2, 1996     Nelson             Sell            7,500   2.05
December 2, 1996     Olympus            Sell            7,500   2.05
</TABLE>

                                                               Page 3 of 5 Pages
<PAGE>
 
     d)   Nelson and Olympus, as the direct beneficial and legal owners of the
          Convertible Securities and the Common Stock held by them, have the
          right to receive or the power to direct the receipt of dividends from,
          or the proceeds from the sale of the Convertible Securities, the
          Common Stock into which the Convertible Securities are convertible and
          the Common Stock held by them.  However, Citadel, as managing general
          partner of Nelson and trading manager for Olympus, ultimately has the
          right to direct such activities.

     e)  As of the date for the filing of this statement, as a result of the
          agreement referred to above, Nelson and Olympus collectively own less
          than 5% of the Issuer's Common Stock.  As a consequence, from and
          after such date Citadel shall not be deemed to be the beneficial owner
          of more than 5% of the Issuer's Common Stock.

                                                               Page 4 of 5 Pages
<PAGE>
 
                                      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.
 
 
Date:  January 23, 1997         Citadel Limited Partnership
 
                                By:  GLB Partners, L.P.,
                                     its general partner

                                By:  Citadel Investment Group, L.L.C.,
                                     its general partner
 
                                By:  /s/Kenneth C. Griffin,
                                     ----------------------
                                     its manager
 
 
 
 
 
 
 
                                                               Page 5 of 5 Pages


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