Audionics Shadow Vector Analysis Unit. $1,300 in 1976. SQ with logic gave 35db channel separation.
Bang & Olufsen Beogram 4002 turntable with plug-in demodulator
Bose 4401 preamp optional SQ & CD-4 plug-in modules. 1974 $500. $75 for the SQ module.
Connaught Equipment Co. supposedly built a SQ decoder with 40db separation in 1974
Super SQ Model One by the Deltek Co. $2,150 in 1977. Stereo Review in its Apr ’77 issue called it the ultimate in SQ decoding
Heathkit; anything by these folks. They provided the parts and instructions. You slapped it together.
Integrex Ltd. Built a decoder up to 1981 that handled SQ, QS, UMX, Matrix H/HJ/UHJ.
Scott 499 amplifier. Supposed to be the first specific “quad component” other than a tape deck to hit the consumer market.
Sansui QSD-1 one of the ‘super decoders’
Any jukebox with built-in decoders. Wurlitzer is supposed to have built a few.
There was a list of rare and hard-to-find vinyl LP’s here, but, they have been removed. The Wild Wooly Wide Web of the World now allows the masses to communicate in many ways, one being the ability to offer quad goodies for sale and trade. The eBay auction site is a nifty place to find what were once rare quad records and hardware. It may take awhile for that rare goody to show up there, but, with patience, pert near anything quad you lust after will show up eventually..