TCC TC-740A Variable Output Mike/Instrument Pickup/Line / RIAA Phono Preamp w/ Level Attenuator 12 volt DC operation; will work anywhere in the world RIAA freq response 20hz-20,000hz +/- 0.5dB, S/N ratio 85dB rear panel level attenuator switch switchable RCA or 1/4" inputs; power indicator switchable for line, dynamic mikes, instrument pickup or phono