0000903112-98-000675 S-4 1 19980320 AMEX AMPEX CORP /DE/ 0000887433 3663 133667696 DE 1231 S-4 33 333-48469 98571157 500 BROADWAY MAIL STOP 3-36 REDWOOD CITY CA 94063-3199 4153672011 500 BROADWAY MAIL STOP 3-36 REDWOOD CITY CA 94063-3199 AMPEX INC /DE/ 19940505 AMPEX INC 19930328 S-4 1 000090311298000675-001-seq1-s-4.txt PROSPECTUS