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The output balance is a cool circuit. I was nerding out over it in the sams last week.
The feedback goes to the presence control, which according to the audio section instructions effects the mid-range of the audio making it possible to have the soloist stand out from the band.
Zenith used the 6BN6 in every TV from the mid 50s till they replaced it with SS audio....in some sets they hid it in a multi-section compaction, but it was there if the detector was tube.
Some of the SS chroma detector sets had somewhat odd green/color in general. The gated beam color detector tube color demodulators this has tend to produce beautiful color. My 29JC20 gated beam looked better than my RCAs before the lousy Sylvania CRT started dying. Same with my old gated beam 25MC33 that I regret selling to a flake that used to visit this site.
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