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I'm confuseder and confuseder. Not only is there some drift with the bottom of the brightness pot grounded, but either way, the pot center tap does not want to be zero for proper picture, but something higher. The pot range is not -8 to +8 v as calculated in normal configuration, going from a volt or two negative to 11 or so positive.
Out of desperation, I swapped out the AGC tube - no difference. Also went back to the video board with the freeze spray, still nothing seems to be sensitive to cold.
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Old TV literature, New York World's Fair, and other miscellany
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