Vintage Sansui QRX-3500 Four Channel Receiver *Working! - But Needs Repair*

This listing is for a vintage Sansui QRX-3500 Four Channel Receiver in truly excellent cosmetic condition considering its age (please see photos). All lights, inputs and functions are working... *HOWEVER* the receiver only produces sound from the front-left and rear-right speaker output terminals. Accordingly, this vintage audio equipment is being sold "as-is" for repair. It could simply need cleaning, or the issue could be more complex. If you are a technician, or have a vintage audio service center nearby (unfortunately, I don't), this unit represents an outstanding value. Once repaired, the receiver in QS synthesizer mode will transform any stereo source into room-filling 4.0 surround sound!

Thanks for looking!

Please note:
I will ship to the lower 48 States ONLY - NO EXCEPTIONS PLEASE. The receiver will be carefully packed for shipment. At around 50 lbs. boxed, this receiver is heavy - so USPS/UPS/FedEx Ground shipping is a flat rate of $85.

Sansui QRX-3500 specs from the web:
• Tuning range: AM/FM
• Power output: 22W/ch into 8Ω (quadraphonic)
• Frequency response: 30Hz to 30kHz
• Total harmonic distortion: 0.5%
• Damping factor: 30
• Signal to noise ratio: 75dB (line)
• Channel separation: 45dB (line)
• Speaker load impedance: 4Ω to 16Ω
• Dimensions: 20.7" x 7.1" x 13.8"
• 40.8 lbs
• Year: circa 1973-74

From Sansui's 1973 brochure:
The QRX-3500 has been conceived and crafted to lead the new generation of quality Sansui 4-channel stereo receivers. Its distinctive styling and high performance specifications have already earned it critical acclaim from professionals and the public alike.

The overall design of the QRX-3500 is based around the new Sansui QS regular matrix system with QS vario matrix 4-channel decoder circuitry and the QS 4-channel Synthesizer. This electronic ensemble works in concert with the 180-watt 4-channel stereo integrated amplifier and high-resolution FM/AM 4-channel stereo tuner sections for total 4-channel versatility in a medium-priced instrument.

A newly-designed Function control lets you select any one of five 4-channel modes (OS Synthesizer, QS regular matrix surround, QS regular matrix hall, and phase matrix) plus a conventional 2-channel position. The QS Synthesizer creates an authentic 4-channel sound field from any 2-channel stereo source, while the positions for QS regular matrix system with new OS vario matrix circuit for decoding all QS and compatible matrix-encoded 4-channel program sources.

Records encoded with the SQ matrix system are heard in full 4-channel sound with the function control in the Phase Matrix position. In addition, there are two sets of discrete 4-channel inputs, adding up to total 4-channel capabilities in one complete unit.