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Nice find. Brings back memories. The 'quad' craze blazed briefly in the mid '70's and quickly died. The only people who made any money from it were magazine and book publishers. I still have a CD-4 decoder -- NIB -- from a cover shoot; last I looked a few years ago, it isn't worth much in dollars, but the 4-discrete-channels-from-one-record-groove technology is neat. (can't connect all this to vintage TV either, but couldn't resist venting a little.) [update: I see Audio did a test report on this model summer of '72.]
Pete
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