DYNACO 4-DIMENSIONAL STEREO DEMONSTRATION DISC Original QUADRAPHONIC LP from 1971 (DYNACO/VANGAURD SPV-7). DYNACO was one of the pioneers of QUADRAPHONIC sound and used DY system. The advantage of their encoding was that you could either use their QUADAPTOR decoding system or use a simple homemade setup using a resistor as diagramed on the back of sleeve. Featuring tracks from the VANGAURD catalog from MOZART, HANDEL, TCHAIKOWSKY, COUNTRY JOE & THE FISH, PERREY, etc. Sleeve is Near Mint (still in original shrink wrap). Record is Near Mint.

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