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I shielded the 12AV6 and then tried replacing it....hum didn't change in either case. I should've mentioned in my original post that the hum is sort of like a 'buzzing' hum, in other words, it has harmonics. It reminds me of grounding issues or RF interference. I guess the next step is to disconnect the clock and see if anything changes. If it doesn't, I'll have to take the radio completely apart again and start checking the circuit for something that isn't properly grounded.
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