Item functions. All knobs and switches work as expected. The problem is that there is a nasty ground hum that comes and goes on all functions. I have tried both phono ports, both AUX ports and the tape monitor ports and there is a pulsing hum that comes and goes. I took a quick look inside to see if there was anything obvious about the ground cables or anything that was weakly soldered and nothing stood out. This is sold AS-IS with no returns. You are buying this well below market and if you can find the hum issue you will have a great integrated amp well below market value. Number of TransistorsSemiconductors present.SemiconductorsMain principleAudio-AmplificationWave bands- withoutPower type and voltageAlternating Current supply (AC) / 100 or 120 or 220 or 240 VoltLoudspeaker- This model requires external speaker(s).Power out90 W (undistorted)MaterialWooden casefrom Radiomuseum.orgModel: Integrated Stereo Amplifier RA-812 - Rotel, The, Co., Ltd.; TokyoShapeBook-shelf unit.Dimensions (WHD)430 x 140 x 330 mm / 16.9 x 5.5 x 13 inchNotesA 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 ohmsfrom 20Hz to 20kHz with no more than 0.3% Total Harmonic DistortionIntermodulation Distortion : < 0.1% at rated outputFrequency Response : 5Hz - 150kHz ± 3dB at 1 watt per channelSpeaker Impedance : A, B (4 to 16?), A+B (8 to 16?)Versions/Power Requirements100/120/220/240 V AC 50-60Hz SwitchableStereo-Verstärker, 2 x 65 Watt Sinus/4 Ohm, max. Klirrfaktor 0,3%; 5 - 150.000 Hz.

Item functions. All knobs and switches work as expected. The problem is that there is a nasty ground hum that comes and goes on all functions. I have tried both phono ports, both AUX ports and the tape monitor ports and there is a pulsing hum that comes and goes. I took a quick look inside to see if there was anything obvious about the ground cables or anything that was weakly soldered and nothing stood out. This is sold AS-IS with no returns. You are buying this well below market and if you can find the hum issue you will have a great integrated amp well below market value. Number of TransistorsSemiconductors present.SemiconductorsMain principleAudio-AmplificationWave bands- withoutPower type and voltageAlternating Current supply (AC) / 100 or 120 or 220 or 240 VoltLoudspeaker- This model requires external speaker(s).Power out90 W (undistorted)MaterialWooden casefrom Radiomuseum.orgModel: Integrated Stereo Amplifier RA-812 - Rotel, The, Co., Ltd.; TokyoShapeBook-shelf unit.Dimensions (WHD)430 x 140 x 330 mm / 16.9 x 5.5 x 13 inchNotesA 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 ohmsfrom 20Hz to 20kHz with no more than 0.3% Total Harmonic DistortionIntermodulation Distortion : < 0.1% at rated outputFrequency Response : 5Hz - 150kHz ± 3dB at 1 watt per channelSpeaker Impedance : A, B (4 to 16?), A+B (8 to 16?)Versions/Power Requirements100/120/220/240 V AC 50-60Hz SwitchableStereo-Verstärker, 2 x 65 Watt Sinus/4 Ohm, max. Klirrfaktor 0,3%; 5 - 150.000 Hz.

Item functions. All knobs and switches work as expected. The problem is that there is a nasty ground hum that comes and goes on all functions. I have tried both phono ports, both AUX ports and the tape monitor ports and there is a pulsing hum that comes and goes. I took a quick look inside to see if there was anything obvious about the ground cables or anything that was weakly soldered and nothing stood out. This is sold AS-IS with no returns. You are buying this well below market and if you can find the hum issue you will have a great integrated amp well below market value. Number of TransistorsSemiconductors present.SemiconductorsMain principleAudio-AmplificationWave bands- withoutPower type and voltageAlternating Current supply (AC) / 100 or 120 or 220 or 240 VoltLoudspeaker- This model requires external speaker(s).Power out90 W (undistorted)MaterialWooden casefrom Radiomuseum.orgModel: Integrated Stereo Amplifier RA-812 - Rotel, The, Co., Ltd.; TokyoShapeBook-shelf unit.Dimensions (WHD)430 x 140 x 330 mm / 16.9 x 5.5 x 13 inchNotesA 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 ohmsfrom 20Hz to 20kHz with no more than 0.3% Total Harmonic DistortionIntermodulation Distortion : < 0.1% at rated outputFrequency Response : 5Hz - 150kHz ± 3dB at 1 watt per channelSpeaker Impedance : A, B (4 to 16?), A+B (8 to 16?)Versions/Power Requirements100/120/220/240 V AC 50-60Hz SwitchableStereo-Verstärker, 2 x 65 Watt Sinus/4 Ohm, max. Klirrfaktor 0,3%; 5 - 150.000 Hz.

Item functions. All knobs and switches work as expected. The problem is that there is a nasty ground hum that comes and goes on all functions. I have tried both phono ports, both AUX ports and the tape monitor ports and there is a pulsing hum that comes and goes. I took a quick look inside to see if there was anything obvious about the ground cables or anything that was weakly soldered and nothing stood out. This is sold AS-IS with no returns. You are buying this well below market and if you can find the hum issue you will have a great integrated amp well below market value. Number of TransistorsSemiconductors present.SemiconductorsMain principleAudio-AmplificationWave bands- withoutPower type and voltageAlternating Current supply (AC) / 100 or 120 or 220 or 240 VoltLoudspeaker- This model requires external speaker(s).Power out90 W (undistorted)MaterialWooden casefrom Radiomuseum.orgModel: Integrated Stereo Amplifier RA-812 - Rotel, The, Co., Ltd.; TokyoShapeBook-shelf unit.Dimensions (WHD)430 x 140 x 330 mm / 16.9 x 5.5 x 13 inchNotesA 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 ohmsfrom 20Hz to 20kHz with no more than 0.3% Total Harmonic DistortionIntermodulation Distortion : < 0.1% at rated outputFrequency Response : 5Hz - 150kHz ± 3dB at 1 watt per channelSpeaker Impedance : A, B (4 to 16?), A+B (8 to 16?)Versions/Power Requirements100/120/220/240 V AC 50-60Hz SwitchableStereo-Verstärker, 2 x 65 Watt Sinus/4 Ohm, max. Klirrfaktor 0,3%; 5 - 150.000 Hz.