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Can you check resistance on V22 6K6 pin 5, then rotate the hold control to see if the range is within tolerance?
The 6AC7 could be pulled to see if the AFC stage is loading and stopping the oscillator, or what else is connected to V22's cathode.....
No experience on early Zenith, just wondering.
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"When resistors increase in value, they're worthless"
-Dave G
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