SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ________________ SCHEDULE 13G (Rule 13d-102) ________________ INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* TEGAL CORPORATION (Name of Issuer) Common Stock (Title of Class of Securities) 879008-10-0 (CUSIP Number) December 31, 1999 (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). Schedule 13G PAGE 3 of 6 CUSIP No. 879008-10-0 (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Morgens, Waterfall, Vintiadis & Co., Inc. 132674766 ________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ________________________________________________________________________ (3) SEC USE ONLY ________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York ________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES _________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 0 OWNED BY _________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING _________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 0 ________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 ________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) Not applicable. ________________________________________________________________________ (12) TYPE OF REPORTING PERSON IA ________________________________________________________________________ Schedule 13G PAGE 4 OF 6 CUSIP No. 879008-10-0 ITEM 1(a). NAME OF ISSUER: TEGAL CORPORATION ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 2201 South McDowell Blvd., P.O. Box 6020, Petaluma, California 94954 ITEM 2(a). NAME OF PERSON FILING: Morgens, Waterfall, Vintiadis & Co., Inc. ITEM 2(b). ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE: The business address of Morgens, Waterfall, Vintiadis & Co., Inc. is 10 East 50th St., New York NY 10022. ITEM 2(c). CITIZENSHIP: New York ITEM 2(d). TITLE OF CLASS OF SECURITIES: common stock ITEM 2(e). CUSIP NUMBER: 879008-10-0 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [ ] Broker or 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] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940: see Rule 13d- 1(b)(1)(ii)(E) (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F) (g) [ ] Parent Holding Company, in accordance with Rule 13d- 1(b)(ii)(G); Schedule 13G PAGE 5 OF 6 CUSIP No. 879008-10-0 (h) [ ] Savings Associations 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 of 1940; (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J). IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c), CHECK THIS BOX. [ ] ITEM 4. OWNERSHIP. Morgens, Waterfall, Vintiadis & Co., Inc. ("MWV & Co.") (a) Amount beneficially owned: 0 (b) Percent of class: Not applicable (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 0 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition 0 MWV & Co., an investment adviser registered under Section 203 of the Investment Advisers Act of 1940, as amended, holds for the accounts of its investment advisory clients, and thereby beneficially owns, within the meaning of Rule 13d-3 under the Securities Exchange Act of 1934, the foregoing shares of Common Stock. 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 [ X ]. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not applicable. Schedule 13G PAGE 6 OF 6 CUSIP No. 879008-10-0 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. (if filing pursuant to Rule 13d-1(c)) By signing below each Reporting Person certifies that, to the best of its 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 not held in connection with or as a participant in any transaction having that purpose or effect. SIGNATURES After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. DATED: February 14, 2000 ______________________________ John C. "Bruce" Waterfall, as President, on behalf of Morgens, Waterfall, Vindiatis & Co., Inc.