Pioneer - SA-7800 Solid state integrated amplifier

Main features

Type: stereo integrated amplifier.
Power: 80 W per channel into 8 Ω (DIN/IEC country variants; typical: 80–90 W/ch).
Topology: traditional analog circuitry with robust toroidal power supply/transformer (vintage model, 1970s–1980s).
Sections: preamplifier, power amplifier, tone controls (bass, treble, balance), loudness, subsonic/contour filter, input separation for phono (MM), tape monitor, AUX input, pre-out/main-in output (on some versions or via jumper).
Controls: source selector, volume control, tone controls, muting/mono, loudness selector, speaker A/B.
Connectivity: phono (MM) inputs, tuner, aux, tape loop; outputs for two pairs of speakers, headphone output.
Construction: heavy chassis, front panel with metal knobs; electrolytic capacitors and precision resistors.