While almost all of the original semi conductors are long out of production there are subs and subs for the subs radily available. Posted throughout this forum are replacements just search with the Mac part number from the schematic or the original number if you can decipher it from the device.
Your amp most likely served a pedestrian life in a lab running a shaker table or driving transducers researching accoustic noise supression 24/7 52 weeks of the year.
No Tom Clancy excitement but certainly a part of the serious scientific lab work behind the scenes.
When I spent a week at Crown years ago for IC training I befriended a fellow attendee who was trying to get a Crown amp approved for naval service. Invited into the far back service and prototype area there it sat.....burnt, miss shaped, but still functioning even as it was tore off the bulkhead after a missle strike.
They were trying to bulk it up to stay put so that it could continue to power the ships PA system even under the duress of a missle hit.
Only then would it be accepted into service.......an amp surviving it's own SEAL training so to speak.
Has anyone else read the naval tech paper evaluating tube amps for service from back in the 60s? I do not know if it is in the AKdatabase but has been posted in the tube forum.
