Possibly wrong forum, but I couldn't find anything closer:

For Sale: Altec model 1592A (rack-mount) Mixer-Amplifier. 4-channel
w/faders, test tone, plug in amp modules, etc. Untested, but appears to be
complete and in good condition. JPEGS avilable. Would probably work for DJ
or "Pirate" radio. $45.00 plus shipping from 93301. Please contact:

sx43ster at gmail dot com.