Sherbourn 1/300MB Mono Power Amplifier 200W Monoblock

I hooked this amp 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 scratches and scuffs on the sides, 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)

E5-1

fdk 80930258