<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13D/A
Under the Securities Exchange Act of 1934
(Amendment No. 12)
GTI Corporation
(Name of issuer)
Common Stock, $0.04 par value per share
(Title of class of securities)
362360 10 9
(CUSIP number)
L Sharp, Company Secretary, Telemetrix Plc, Knaves Beech Estate, Loudwater,
High Wycombe, Buckinghamshire HP10 9QZ England
(Name, address and telephone number of person
authorized to receive notices and communications)
February 6, 1998
(Date of event which requires filing
of this statement)
If the filing person has previously filed a statement on Schedule 13G to report
the transaction 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 [_].
(Continued on following pages)
(Page 1 of 7 Pages)
<PAGE>
AMENDMENT NO. 12 TO
SCHEDULE 13D
This Amendment No. 12 to Schedule 13D is being filed on behalf of Dr.
William P. Venter ("Venter"), Biltron (PTY) Limited, a South African corporation
("Biltron"), Ventron Corporation Limited, a South African corporation
("Ventron"), Allied Electronics Corporation Limited, a South African corporation
("Altron"), Telemetrix PLC, a company incorporated in England and Wales
("Telemetrix"), Telemetrix Investments Limited, a company incorporated in
England and Wales ("Investments"), and Telemetrix Overseas Investments BV, a
Dutch corporation ("Overseas") (collectively, the "Reporting Persons"), to amend
the Schedule 13D, dated February 20, 1987, as amended by Amendment No. 1, dated
June 13, 1987, Amendment No. 2, dated October 2, 1987, Amendment No. 3, filed on
or about November 14, 1988, Amendment No. 4, dated February 17, 1989, Amendment
No. 5, dated March 22, 1990, Amendment No. 6 dated September 17, 1990, Amendment
No. 6(sic) dated February 6, 1992, Amendment No. 7(sic) dated March 31, 1992,
Amendment No. 9 dated December 7, 1992, Amendment No. 10 dated August 8, 1994
and Amendment No. 11 dated May 30, 1997 (as amended, the "Schedule 13D"),
relating to shares of Common Stock, par value $.04 per share ("GTI Common
Stock"), issued by GTI Corporation, a Delaware corporation ("GTI").
Item 4. Purpose of Transaction.
At the time of its initial acquisition of GTI Common Stock, Altron had
been interested in investing in one or more United States-based companies with
operations in fields related to those of its South African and international
operating subsidiaries. The principal purpose of the acquisitions of the shares
of GTI Common Stock and GTI Preferred Stock described in paragraphs
(a),(b),(c),(d) and (e) of Item 3 hereof was to effect such investments.
The principal purpose of the acquisition of the GTI Common Stock
described in paragraph (f) of Item 3 hereof was to provide a portion of the
funds required by GTI in connection with GTI's acquisition of approximately 91%
of the outstanding capital stock of Valor Electronics, Inc., a California
corporation, which develops, manufactures and distributes a variety of
electronic component parts and subsystems.
The purpose of Telemetrix's contribution of 3,919,300 shares of GTI
Common Stock and 8,110 shares of GTI Preferred Stock to Investments, a wholly-
owned subsidiary of Telemetrix, described in paragraph (g) of Item 3 hereof was
to effect an internal restructuring of the investments of Telemetrix.
The purpose of the acquisition described in paragraph (h) of Item 3
hereof was to provide a portion of the funds for the acquisition by GTI of 71.5%
of Promptus Communications, Inc., a Rhode Island corporation, on January 6,
1995. The percentage of the outstanding GTI Common Stock beneficially owned by
the Reporting Persons did not change as a result of the foregoing acquisition as
GTI concurrently issued an additional 275,000 shares to unrelated third parties.
The purpose of Investments' transfer of 450,000 shares of GTI Common
Stock to Telemetrix and Telemetrix's subsequent contribution of such 450,000
shares of GTI Common Stock to Overseas described in paragraph (i) of Item 3
hereof was to effect an internal restructuring of the investments of Telemetrix.
Telemetrix provided the loan to Valor Electronics Inc., a wholly-owned
subsidiary of GTI, and obtained the Common Stock Purchase Warrant in connection
with the loan described in paragraph (j) of Item 3 hereof, for the purpose of
2
<PAGE>
providing Valor with funds needed to alleviate liquidity shortfalls caused
primarily by operating losses experienced at that time.
On February 6, 1998, GTI announced that it had engaged an investment
bank to investigate alternative business strategies including a possible sale of
GTI. In the event of such a sale, Telemetrix, Investments and Overseas, the
only remaining Reporting Persons beneficially owning GTI Common Stock (the
"Telemetrix Reporting Persons"), would be willing to sell some or all of their
GTI Common Stock if a price acceptable to the Telemetrix Reporting Persons can
be obtained. Except as described herein, the Telemetrix Reporting Persons do
not have any plans or proposals which relate to, or could result in, any of the
matters referred to in paragraphs (a) through (j), inclusive, of Item 4 of the
Securities and Exchange Commission form of report on Schedule 13D. However, the
Telemetrix Reporting Persons will continue to review the business of GTI and,
depending upon the price of GTI Common Stock, subsequent developments affecting
GTI, GTI's business and prospects, other investment and business opportunities
available to the Telemetrix Reporting Persons, general stock market and economic
conditions, tax considerations and other factors deemed relevant, may in the
future determine to take one or more of such actions.
3
<PAGE>
SIGNATURES
After reasonable inquiry and to the best of their knowledge and
belief, the undersigned certify that the information set forth in this Amendment
statement is true, complete and correct.
Dated: February 18, 1998
/s/ WILLIAM P. VENTER
-------------------------------------
Dr. William P. Venter
BILTRON (PTY) LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director
VENTRON CORPORATION LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director/Chairman
ALLIED ELECTRONICS CORPORATION LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director/Chairman
TELEMETRIX PLC
By: /s/ TIMOTHY M. CURTIS
----------------------------------
Name: Timothy M. Curtis
Title: Director
S-1
<PAGE>
TELEMETRIX INVESTMENTS LIMITED
By: /s/ TIMOTHY M. CURTIS
----------------------------------
Name: Timothy M. Curtis
Title: Director
TELEMETRIX OVERSEAS INVESTMENTS BV
By: /s/ B.D. RATTRAY
----------------------------------
Name: B.D. Rattray
Title: Director
S-2
<PAGE>
EXHIBIT P
---------
JOINT FILING STATEMENT
Pursuant to Rule 13d-1(f)
The undersigned acknowledge and agree that the foregoing Amendment No.
12 to Schedule 13D ("Amendment No. 12") is filed on behalf of each of the
undersigned. The undersigned acknowledge that each shall be responsible for the
timely filing of any required amendments, and for the completeness and accuracy
of the information concerning him or it contained in Amendment No. 12 or any
subsequent amendment filed by or on behalf of him or it, but shall not be
responsible for the completeness and accuracy of the information concerning any
others, except to the extent that he or it knows or has reason to believe that
such information is inaccurate.
Dated: February 18, 1998
/s/ WILLIAM P. VENTER
-------------------------------------
Dr. William P. Venter
BILTRON (PTY) LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director
VENTRON CORPORATION LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director/Chairman
ALLIED ELECTRONICS CORPORATION LIMITED
By: /s/ WILLIAM P. VENTER
----------------------------------
Name: Dr. William P. Venter
Title: Director/Chairman
P-1
<PAGE>
TELEMETRIX PLC
By: /s/ TIMOTHY M. CURTIS
----------------------------------
Name: Timothy M. Curtis
Title: Director
TELEMETRIX INVESTMENTS LIMITED
By: /s/ TIMOTHY M. CURTIS
----------------------------------
Name: Timothy M. Curtis
Title: Director
TELEMETRIX OVERSEAS INVESTMENTS BV
By: /s/ B.D. RATTRAY
----------------------------------
Name: B.D. Rattray
Title: Director
P-2
