04-27-2023, 02:38 PM
I agree with Bob. My first thought was R4 and/or C10, but if they are new and good, it isn't those parts. That leaves the 12SK7 RF amp tube.
Although, if the primary of T2 is doing odd things (e.g. intermittent), that could cause it as well. But try the 12SK7 first. If it is ok, then it would be prudent to monitor the plate voltage of the 12SK7 RF amp for fluctuations.
Although, if the primary of T2 is doing odd things (e.g. intermittent), that could cause it as well. But try the 12SK7 first. If it is ok, then it would be prudent to monitor the plate voltage of the 12SK7 RF amp for fluctuations.
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Ron Ramirez
Ferdinand IN
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