Integrated Amplifier RA-1412

A 2 x 110 watt integrated hi-fi amplifier. Connections for three pairs of loudspeakers, A, B and C. Rotary controls for Bass, Treble, Volume/Balance and Microphone mixing level. Press buttons for Power, Speakers A, B and C, Phono1, Phono2, Tuner, Aux 1 and Aux 2. Rotary controls for Mode (Reverse, Stereo, Left, Right, L + R (mono)), and Tape Monitor (1 > 2, 1 Play, Source, 2 Play, 2 > 1). Switches for Bass Turnover (400Hz, 200Hz, Out), Treble Turnover (5kHz, 2.5kHz, Out), Low Filters, High Filters, Loudness and Muting. Left and Right Power meters, Jacks for two headphones and a microphone.  Switch on the back (Unite, Separated) to connect or disconnect the Pre-amplifier from the Power Amplifier.

Power Amplifier Section :
Continuous Power Output :
110 watts per channel, min. RMS both channels driven into 8 ohms or
150 watts per channel, min. RMS both channels driven into 4 ohms
from 20Hz to 20kHz with no more than 0.1% Total Harmonic Distortion
Harmonic Distortion .............:  0.1% at rated power output 20Hz to 20kHz
Intermodulation Distortion .....:  0.03% at 1kHz, rated power output -1dB
Frequency Response ...........:  3Hz - 100kHz, - 1dB at 1 watt per channel
Damping Factor ...................:  80 ± 10%
Input Sensitivity/Impedance ..:  980mV/33kΩ
Speaker Impedance .............:  4 to 16Ω, A, B or C ; 8 to 16Ω, A + B, A + C, B + C

Pre-Amplifier Section :
Output Voltage/Impedance ...:  980mV/100Ω 2V maximum
Harmonic Distortion .............:  < 0.08% at rated output voltage
Frequency Response ...........:  3Hz - 50kHz, ± 1dB  
Signal to Noise Ratio :
  Phono 1, Phono 2, Mic .....:  > 75dB
  Tape, Tuner, Aux1, Aux2 ...:  > 95dB
Input Sensitivity/Impedance:
  Phono 1, Phono 2 .............:  2mV, 4mV, 8mV / 25kΩ, 50kΩ, 100Ω Adjustable
  Tape, Tuner, Aux1, Aux2 ...:  150mV/50kΩ
  Microphone ......................:  2.5mV/50kΩ
Output Level Tape Out .........:  350mV/3.3kΩ RCA Jack ; 120mV/90kΩ DIN Jack

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

Semi-Conductors used :
62 transistors, 1 IC, 28 diodes.

Stereo Verstärker mit 2 x 150 Watt Sinus an 4 Ohm.
Max. Klirrfaktor 0,1%. Übertragungsbereich +/-3dB bei 1 Watt 3 - 100.000 Hz.

Here you find 338 models, 327 with images and 32 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Rotel, The, Co., Ltd.; Tokyo