(1974-12) SQ Stereo Enhancement [CBS Labs]

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Soundfield

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Not China but the orient in general. The stocks could've easily made their way to China over the years! I'm sure China would've/could've been a dumping ground for such items!
Your faith in China as being a reliable source of genuine components is not universally shared.
 

barfle

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Yes for the decoder/encoder I would suggest using the Fosgate circuit. It's six pole and all the parts are readily available, but I would recommend using a better op amp than the TL084. On the other hand the MC1312P and the after market ECG/NTE type replacements are also readily available.

The enhancement circuit should produce 90° phase shifts as that's what you need to simulate SQ encoding.
Are schematics available?
 

par4ken

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Are schematics available?
Yes just flip back earlier in this thread!

 

MidiMagic

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I got everything from ECG replacement parts in the 1970s - two sets. But I never used them. I intended to build the decoder when I had time.

NTE took over the ECG line in the 1990s.
 
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