Exhibit 10.18
                               AMENDMENT NO. 4 TO
                           LOAN AND SECURITY AGREEMENT


                                                                  March 23, 1999



All American Semiconductor, Inc.
16115 Northwest 52nd Avenue
Miami, Florida  33014
Attention:  Chief Financial Officer

Ladies and Gentlemen:

                  Reference is made to the Loan and Security  Agreement dated as
of May 3,  1996  among  Harris  Trust  and  Savings  Bank,  as a  Lender  and as
Administrative  Agent for the Lenders,  American National Bank and Trust Company
of Chicago,  as a Lender and as  Collateral  Agent for the Lenders and the other
Lenders party thereto and All American  Semiconductor,  Inc., as amended to date
(the "Loan  Agreement").  Unless defined herein,  capitalized  terms used herein
shall have the meanings provided for such terms in the Loan Agreement.

                  Borrower has requested that  Requisite  Lenders agree to amend
the Loan Agreement in order to modify certain financial  covenants  contained in
the Loan  Agreement  and certain  related  definitions.  Requisite  Lenders have
agreed to the  foregoing  on the terms and pursuant to the  conditions  provided
herein.

                  Therefore, the parties hereto hereby agree as follows:

                  1.    AMENDMENTS  TO LOAN  AGREEMENT.  The Loan  Agreement  is
hereby amended, as follows:

                  (a)   SECTION 1.1. The  definition  of the term "Debt  Service
Coverage Ratio" contained in Section 1.1 of the Loan Agreement is hereby amended
and restated, as follows:

                        " 'DEBT SERVICE COVERAGE RATIO' shall mean, with respect
                  to the Designated  Companies for any period,  the ratio of (a)
                  the sum of (i) Net Income  from  continuing  and  discontinued
                  operations  before  interest  expense  and  taxes,  PLUS  (ii)
                  depreciation  and  amortization  expenses,   MINUS  (iii)  tax
                  payments,  MINUS (iv) capital expenditures,  to the extent not
                  financed, MINUS (v) dividends paid, and PLUS (vi) with respect
                  only to  calculations  made for the testing  periods ending on
                  each of December 31, 1998,  March 31, 1999,  June 30, 1999 and
                  September 30, 1999,  charges taken in the 1998 fiscal year and
                  associated with the proposed Reptron Merger, to (b) the sum of
                  (i) all interest  payments in respect of the  Revolving  Loans
                  PLUS (ii) all payments of principal and interest in respect of
                  capitalized  leases and other  long-term  indebtedness  of the
                  Designated Companies,  including without limitation the Junior
                  Debt (but specifically excluding principal payments in respect
                  of the Revolving  Loans),  all determined for such period on a
                  consolidated basis and in accordance with GAAP."

                  (b)   SECTION  8.12.  Clause (ii) of Section  8.12 of the Loan
Agreement is hereby amended and restated in its entirety, as follows:

                        "(ii) Five  Million  Dollars  ($5,000,000)  for the 1999
fiscal year or any fiscal year thereafter."



                  (c)   SECTION 8.17. The table contained in Section 8.17 of the
Loan Agreement is hereby amended and restated in its entirety, as follows:

                                   "PERIOD                   AMOUNT
                                   -------                   ------
         December 31, 1998 through and including            $24,400,000
           December 30, 1999

         December 31, 1999 through and including            $26,000,000
           December 30, 2000

         December 31, 2000 through and including            $27,600,000
           December 30, 2001

         December 31, 2001 through and including           $29,200,000"
           May 3, 2002

                  (d)   SCOPE.  This  Amendment  No.  4  to  Loan  and  Security
Agreement  shall have the effect of amending  the Loan  Agreement  and the other
Financing  Agreements as appropriate to express the agreements contained herein.
In all other  respects,  the Loan Agreement and the other  Financing  Agreements
shall remain in full force and effect in accordance with their respective terms.

                  2.    CONDITIONS  TO  EFFECTIVENESS.  This  Amendment No. 4 to
Loan and Security  Agreement shall be effective  immediately  upon the execution
hereof by Requisite  Lenders,  the  acceptance  hereof by each Borrower and each
Guarantor,  and the delivery  hereof to the  Administrative  Agent,  at 111 West
Monroe Street,  Chicago,  Illinois  60603,  Attention:  Mr.  William Kane,  Vice
President, on or before March 23, 1999.

                                  Very truly yours,

                                     HARRIS TRUST AND SAVINGS BANK,
                                       as Administrative Agent and a Lender
                                     Pro Rata Share:  25%

                                     By:  /s/ WILLIAM J. KANE
                                          -------------------------------------
                                     Its:  Vice President
                                          -------------------------------------

                                     AMERICAN NATIONAL BANK AND TRUST
                                       COMPANY OF CHICAGO,
                                       as Collateral Agent and a Lender
                                     Pro Rata Share:  25%

                                     By:  /s/ M. MARTHA GASKIN
                                          -------------------------------------
                                     Its:  Vice President
                                          -------------------------------------

                                       -2-



                                     FLEET BUSINESS CREDIT CORPORATION,
                                      formerly known as SANWA BUSINESS
                                      CREDIT CORPORATION,  as a Lender
                                     Pro Rata Share:  12.5%


                                     By: /s/ DANIEL J. MANELLA
                                          -------------------------------------
                                     Its:  Vice President
                                          -------------------------------------


                                     MERCANTILE BUSINESS CREDIT, INC.,
                                      as a Lender
                                     Pro Rata Share:  12.5%

                                     By:
                                          -------------------------------------
                                     Its:
                                          -------------------------------------


                                     BNY FINANCIAL CORPORATION,
                                      as a Lender
                                     Pro Rata Share:  12.5%

                                     By:  /s/ A. VIOLA
                                          -------------------------------------
                                     Its:  Vice President
                                          -------------------------------------


                                     NATIONSBANK, N.A., successor by merger to
                                      NATIONSBANK OF TEXAS, N.A.,
                                      as a Lender
                                     Pro Rata Share:  12.5%

                                     By:
                                          -------------------------------------
                                     Its:
                                          -------------------------------------



Acknowledged and agreed to as of
this 23rd day of March, 1999.

ALL AMERICAN
  SEMICONDUCTOR, INC.


By: /s/ HOWARD L. FLANDERS
    ---------------------------------
Its:  EVP & CFO
    ---------------------------------

                                      -3-



                   ACKNOWLEDGMENT AND ACCEPTANCE OF GUARANTORS

                  Each of the undersigned, in its capacity as a Guarantor of the
Liabilities of Borrowers to Agents and Lenders under the Loan Agreement,  hereby
acknowledges  receipt  of the  foregoing  Amendment  No. 4 to Loan and  Security
Agreement,  accepts and agrees to be bound by the terms  thereof,  ratifies  and
confirms all of its obligations under the Master Corporate  Guaranty executed by
it and agrees that such Master  Corporate  Guaranty shall continue in full force
and effect as to it, notwithstanding such amendment.


                                            Dated:  March 23, 1999

                                            Each of the Subsidiaries of 
                                            All American Semiconductor, Inc.


                                            By:   /s/ HOWARD L. FLANDERS
                                                  -----------------------------
                                            Its:  EVP & CFO 
                                                  -----------------------------

                                      -4-