Sherbourn 1/300MB Mono Power Amplifier 200W Monoblock
I hooked this up to a speaker and a microphone and it powers on, and my voice does go through the speaker. This is as far as I have been able to test it. There is a dent on the top and some minor scratches and scuffs, but it is overall in good condition.
Power output: 200 watts into 8Ω (mono)
Frequency response: 5Hz to 75kHz
Input sensitivity: 1.1V
Signal to noise ratio: 110dB
Speaker load impedance: 4Ω (minimum)
At the time of this listing, I have 4 of these. $250 each. Cash, Zelle or Venmo.