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Intermittent buzz in vintage tube amp (Silvertone 1472)
Hi y'all,
I've been away from this forum for maybe two or three years now...
I have a friend's mid-60s Silvertone 1472 amp on my bench. I did some general overhaul, coupling and filter caps replaced, but it has a very annoying problem:
it has an intermittent buzz (like a buzzy low-frequency put-put-put) whose intensity goes along with the volume pots: disappears with either pots at 0 and is higher with the pots at 10. The put-put buzz is there also with the 6AU6 (tremolo) tube off and is not affected by the position of either tremolo pots. Different preamp tubes did not bring any change.
What should I check now?
The schematic is attached.
TIA,
Carlo
I've been away from this forum for maybe two or three years now...
I have a friend's mid-60s Silvertone 1472 amp on my bench. I did some general overhaul, coupling and filter caps replaced, but it has a very annoying problem:
it has an intermittent buzz (like a buzzy low-frequency put-put-put) whose intensity goes along with the volume pots: disappears with either pots at 0 and is higher with the pots at 10. The put-put buzz is there also with the 6AU6 (tremolo) tube off and is not affected by the position of either tremolo pots. Different preamp tubes did not bring any change.
What should I check now?
The schematic is attached.
TIA,
Carlo
Attached Files
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