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AmplifiersStereo ReceiversDiscontinued
Estimated price (community-sourced)
$250
Around — community and catalog average, updates slowly
About the SX-680
The Pioneer SX-680 is a vintage AM/FM stereo receiver introduced in 1978. Its amplifier is rated to deliver 30 watts per channel into 8-ohm speakers, with a stated total harmonic distortion of no more than 0.1%. It includes phono, auxiliary, and tape connections, bass and treble controls, loudness and muting functions, and speaker outputs for two pairs of speakers. The receiver was sold until about 1980.
Specifications
Type: AM/FM stereo receiver
Continuous power output: 30 W per channel into 8 ohms; 37 W per channel into 4 ohms (20 Hz–20 kHz, no more than 0.1% THD)
Frequency response: 5 Hz–100 kHz (+3 dB, AUX/TAPE PLAY)
Total harmonic distortion: 0.1% maximum at rated output
Damping factor: 25
Input sensitivity: Phono 2.5 mV; AUX/TAPE PLAY 150 mV
Signal-to-noise ratio: Phono 75 dB; line 90 dB
Tuning bands: FM, AM
Speaker load impedance: 4 ohms minimum
Dimensions: 435 × 144.5 × 314 mm (17-1/8 × 5-5/8 × 12-3/8 in)
Weight: 8.9 kg (19 lb 9 oz)
Power requirements: 120 V, 60 Hz