Integrated Stereo Amplifier RA-812

A 2 x 45 watt integrated hi-fi amplifier. Rotary controls for Bass, Treble, Volume/Balance and Microphone Mixing level. Rotary switches for Speakers (Off, 1, 2, 1+2, Speaker 4 CH), Tape Monitor (1 > 2, 1 Play, Source, 2 Play,  2 > 1) and Function (Phono 2, Phono 1, Tuner, Aux1, Aux2). Push button for Power. Switches for Subsonic Filter, Low Filter, High Filter, Tone Defeat, Stereo/Mono, Loudness and Muting (-15dB). Left and Right Power Meters. Jacks for Headphones and Microphone. Connections for two pairs of loudspeakers.

Continuous Power Output :
45 watts per channel, min. RMS both channels driven into 8 ohms
from 20Hz to 20kHz with no more than 0.3% Total Harmonic Distortion
Intermodulation Distortion : < 0.1% at rated output
Frequency Response :  5Hz - 150kHz ± 3dB at 1 watt per channel
Speaker Impedance  :  A, B (4 to 16Ω), A+B (8 to 16Ω)

Versions/Power Requirements
100/120/220/240 V AC 50-60Hz Switchable

Stereo-Verstärker, 2 x 65 Watt Sinus/4 Ohm, max. Klirrfaktor 0,3%; 5 - 150.000 Hz.

In questo link sono elencati 340 modelli, di cui 329 con immagini e 32 con schemi.
Elenco delle radio e altri apparecchi della Roland Electronics Co. Ltd., Rotel; Tokyo