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On the vertical issue; Nov 1962 PF reporter special color TV issue noted that thermistor was added starting with the 27KC20 chassis, to compensate for size variation during warm up.
Color: Id check all those peaking coils, and maybe Robert L. Goodman noted this chassis issue in the TAB color manual for Zenith.
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"When resistors increase in value, they're worthless"
-Dave G
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