Sansui QS-1 Vintage Quadraphonic Synthesizer / Quad Processor

This rare gem is in excellent condition both functionally and cosmetically. It was previously owned by a retired audio engineer and avid vintage collector. All lights, controls and switches are working. Cosmetic condition is excellent... just a few light scratches on the top of the case. Otherwise, it is pristine... I don't see any blemishes on the face. See photos for details.