Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
We appreciate your help
in keeping this site going.
Could they be the amplifier chassis, removed from a big radio or organ or something? Perhaps most of the gain was originally on another chassis, connected via those multi pin plugs near the back.
Threaded Mode