<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934

                                (Amendment No. 1)
                                               --

                             Alpha Industries, Inc.
                    ---------------------------------------
                                (Name of Issuer)

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

                                  020753-10-9
                               ------------------
                                 (CUSIP Number)


*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).


                       (Continued on following pages(s))




<PAGE>



                                  SCHEDULE 13G

CUSIP NO. 020753-10-9

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

1)   Name of Reporting Person           Travelers Group Inc.

     S.S. or I.R.S Identification       52-1568099
     No. of Above Person

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

2)   Check the Appropriate Box                    (a)
     if a Member of a Group                       ----------------------------
     (See Instructions)                           (b)
                                                  ----------------------------

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

3)   SEC Use Only

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

4)   Citizenship or Place of Organization                              Delaware

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

Number of Shares    (5)  Sole Voting Power                                    0
Beneficially Owned  (6)  Shared Voting Power                            179,150
by Each Reporting   (7)  Sole Dispositive Power                               0
Person with         (8)  Shared Dispositive Power                       179,150

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

9)   Aggregate Amount Beneficially
     Owned by Each Reporting Person                                     179,150

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

10)  Check if the Aggregate Amount
     in Row 9 Excludes Certain
     Shares (See Instructions)

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

11)  Percent of Class Represented
     by Amount in Row 9                                                    1.8%

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

12)  Type of Reporting Person                                                HC
     (See Instructions)

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



<PAGE>



Item 1(a) Name of Issuer:

     Alpha Industries, Inc.

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

     20 Sylvan Road
     Woburn, MA      01801

Item 2(a) Names of Persons Filing:

     Travelers Group Inc. ("TRV")

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

     The address of the principal business office of TRV is:

     388 Greenwich Street
     New York, NY  10013

Item 2(c) Citizenship:

     TRV is a Delaware corporation.


Item 2(d) Title of Class of Securities:

     Common Stock


Item 2(e) CUSIP Number:

     020753-10-9


<PAGE>



Item 3.   If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
          check whether the person filing is a:

          (a)  [   ]  Broker or Dealer registered under Sec. 15 of the Act

          (b)  [   ]  Bank as defined in Sec. 3(a)(6) of the Act

          (c)  [   ]  Insurance Company as defined in Sec. 3(a)(19) of the Act

          (d)  [   ]  Investment Company registered under Sec. 8 of the
                      Investment Company Act

          (e)  [   ]  Investment Adviser registered under Sec. 203 of the
                      Investment Advisers Act of 1940

          (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
                      Sec. 240.13d-1(b)(1)(ii)(F)

          (g)  [ X ]  Parent Holding Company, in accordance with Sec. 240.13d-
                      1(b)(ii)(G)  (Note: See Item 7)

          (h)  [   ]  Group, in accordance with Sec. 240.13d-1(b)(1)(ii)(H)


Item 4. Ownership (as of October 31, 1997)

          (a)  Amount Beneficially Owned:  See Item 9 of cover pages

          (b)  Percent of Class:  See Item 11 of cover pages

          (c)  Number of shares as to which such person has:

               (i)  sole power to vote or to direct the vote

               (ii)  shared power to vote or to direct the vote

               (iii)  sole power to dispose or to direct the disposition of

               (iv)  shared power to dispose or to direct the disposition of

          See Items 5-8 of cover pages

<PAGE>



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.


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.

<PAGE>



Item 10.  Certification

     By signing below I certify that, to the best of my knowledge, the
     securities referred to above were acquired in the ordinary course of
     business and were not acquired for the purpose of and do not have the
     effect of changing or influencing the control of the issuer of such
     securities and were not acquired in connection with or as a participant in
     any transaction having such purposes 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.

Date: November 7, 1997
              ---
                      TRAVELERS GROUP INC.



                      By: /s/ Charles J. Gallo, Jr.
                         ---------------------------
                         Name:  Charles J. Gallo, Jr.
                         Title:   Assistant Controller

<PAGE>



                         EXHIBIT INDEX TO SCHEDULE 13G
                         -----------------------------



EXHIBIT 1
- ---------

Disclaimer of beneficial ownership by
TRV





<PAGE>

                                   EXHIBIT 1
                                   ---------

                       DISCLAIMER OF BENEFICIAL OWNERSHIP
                       ----------------------------------

The undersigned disclaims beneficial ownership of the securities referred to 
in the Schedule 13G to which this exhibit is attached, and the filing of this 
Schedule 13G shall not be construed as an admission that the undersigned is, 
for the purpose of Section 13(d) or 13(g) of the Securities Exchange Act of 
1934,  as amended, the beneficial owner of any securities covered by this 
Schedule 13G.

Date: November  7, 1997









                      TRAVELERS GROUP INC.



                      By: /s/ Charles J. Gallo, Jr.
                         ---------------------------
                         Name:  Charles J. Gallo, Jr.
                         Title:   Assistant Controller