0000903112-98-001906 S-4/A 1 19981030 AMEX AMPEX CORP /DE/ 0000887433 3663 133667696 DE 1231 S-4/A 33 333-63921 98734685 500 BROADWAY MAIL STOP 3-36 REDWOOD CITY CA 94063-3199 6503672011 500 BROADWAY MAIL STOP 3-36 REDWOOD CITY CA 94063-3199 AMPEX INC /DE/ 19940505 AMPEX INC 19930328 S-4/A 1 000090311298001906-001-seq1-s-4-a.txt PROSPECTUS