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I have a Zenith 25NC33 that used to more than tingle when I touched any knob.
I had a balun short connected to VHF in and blow the balun in the tuner. It had to have the black wire from the power transformer disconnected or it would blow one of the voltage doubler caps. I finally found the power transformer had a short primary to chassis. Replaced it and no more problems. I would check primary to chassis, secondaries to chassis and primary to secondaries for a short. I would think lightning caused my problem. It's worth a try.
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