Technics - SA8000X Solid state multi-channel receiver

Beautiful 70s QUADROPHONIC Sintoamplificatore recently checked/reviewed by a technician, everything is working, all lights have been replaced.
Rear switch STEREO/QUADRAPHONIC
Stereo audio power: 2x 57 W (4 ohms) 2x 36 W (4 ohms)
Quadraphony depth adjustable with sliders

General
• Manufacturer: Technics
• Model: SA-8000X
Type: Quadraphonic receiver
• Years of manufacture: 1976 - 1977
• Made in: Japan
• Color: brushed aluminum front, wooden cabinet
• Power consumption: 290 W max.
• Dimensions: 495 x 160 x 400 mm (W x H x D)
• Weight: 13.5 kg
Connections
• Number of inputs:
o Phono 1, 2: 2 mV, 50 kOhm, max 330 mV
o Aux 2-channel: 150 mV, 60 kOhm
o Aux 4-channel: 150 mV, 60 kOhm
o Tape playback 1, 2, 2-channel: 150 mV, 60 kOhm
o Tape DIN playback 2-channel: 150 mV, 60 kOhm
o Tape playback 1, 2, 4-channel: 150 mV, 60 kOhm
o Tape DIN playback 4-channel: 150 mV, 60 kOhm
o 4-channel discrete: 150 mV, 60 kOhm
o Main In:
o Antenna (FM: 75, 300 Ohm, AM)
o Microphone (6.3 mm jack).
• Number of outputs:
o Tape recording 1, 2: 150 mV
Tape DIN recording: 30 mV
o Dolby NR adapter:
o Pre-out: 1 V
o Headphones (6.3 mm jack): 1 front, 1 rear
o 2 pairs of front speakers
o 2 pairs of rear speakers

Technical data
Amplifier
• Continuous power into 4 channels (with distortion):
o 8 Ohm: 4x 13 W (RMS, 20 Hz - 20 kHz, 0.5%), 4x 22 W (1 kHz).
o 4 Ohm: 4x 18 W (RMS, 20 Hz - 20 kHz, 0.5%), 4x 30 W (1 kHz)
• Continuous power into 2 channels (with distortion factor):
o 8 Ohm: 2x 36 W (RMS, 20 Hz - 20 kHz, 0.5%), 2x 42 W (1 kHz)
o 4 Ohm: 2x 57 W
• Dynamic power:
o 8 Ohm:
o 4 Ohm: 160 W
• Total harmonic distortion: < 0.5 %
• Damping factor: 30 at 8 Ohm
• Frequency response: 10 Hz - 50 kHz, +0 dB, -3 dB
• Power bandwidth: 5 Hz - 40 kHz, -3 dB (4 ohm)
• Signal-to-noise ratio:
o Phono: 79 dB
o High-level: 90 dB
• Tone controls:
o Bass: ± 13 dB at 50 Hz
o Treble: ± 10 dB at 10 kHz
• Loudness: + 10 dB at 50 Hz, + 3 dB at 10 kHz
• Treble filter: - 10 dB at 10 kHz, 6 dB / octave
• Subsonic: - 10 dB at 50 Hz, 6 dB / octave
• Muting: yes, - 20 dB
• AFD control (matrix)
o WIDTH: Alpha = 0 - 1
o DEPTH: Beta = 0 - 1
o Phase behind the channel, difference:
 90 degrees 90 degrees
 0 degrees 0 degrees
 180 degrees 180 degrees
• AFD control (separate):
 WIDTH: Gamma = 0 - 1
 DEPTH: Gamma = 0 – 1
• Tuner
• Reception: FM, MW
• Frequencies:
o FM: 88 - 108 MHz
o MW: 530 - 1,605 kHz
• Input sensitivity:
o FM: 1.9 µV
o MW: 20 µV
• Frequency response: 20 - 13,000 Hz, ± 1 dB
• Distortion factor:
o FM, 1 kHz: < 0.3% (mono), < 0.4% (stereo)
• Signal-to-noise ratio:
o FM: 65 dB (mono), 60 dB (stereo)
MW: 55 dB
• Channel separation: 40 dB (1 kHz)
• Selectivity: 65 dB
• Co-wave select: 1.8 dB
• Image frequency rejection:
o FM: 55 dB
MW:
• IF rejection:
o VHF: 60 dB
MW:
• AM suppression: 50 dB

CD-4 demodulator section:
• Input sensitivity: 2.5 mV
• Input impedance: 100 kOhm
• Distortion factor: 0.07
• Signal-to-noise ratio: > 70 dB
• Channel separation at 1 kHz:
o Left-Right: 40 dB
Front-Back: 25 dB
• Frequency range: 30 - 15,000 Hz

Special features
• 4-channel AFD control, discrete / stereo / mono
• Separate bass and treble control for front/rear
• Microphone mixer
• Acoustic field influencer:
o Width adjustable via sliders
Depth adjustable via sliders