Known_issues: Time delay mini amps prone to hum

Pre Amp C-4000 watts @ 8 ohm   used (low) $180.00
channels 2 watts @ 4 ohm   used (high) $460.00
    watts bridged   used (latest) $200.00
color Silver       used (ave) $250.00
years 79-85       trend
retail $867.00       amount