Quote:
Originally Posted by Electronic M
Zenith never built their own signal tubes, and ISTR a Zenith film where they touted that demodulator circuit as being their own design. It is quite possible that GE color demod tube existed because Zenith had GE make it for them.
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That's the issue though, nobody actually used the 6AR8 in a television set that I've been able to find. It saw some use in ham radio equipment as a product detector, especially as SSB took off, but I don't think it ever saw use in a television set.
Why would Zenith order a tube from GE they weren't going to use?