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I have a Marshall 5210 that has the "wind on a microphone" sound.
The Master Volume affects the noise, but neither of the channel controls do.
If I scope it with my DI I can hear the noise on IC1a pin 1 (near top right on schematic), from that node it is on both sides of C26 and then will die at the master if it's turned down.
I don't hear the noise at any other point. Thought IC1 was the culprit since it seems to originate there (no noise on pin 2), but I replaced that, then I replaced R9, then C26, then R59... now I am pretty much stumped.
I deox'd the pot with no change, rotating it does not seem to have any affect on the noise.
Any help would be greatly appreciated.
The Master Volume affects the noise, but neither of the channel controls do.
If I scope it with my DI I can hear the noise on IC1a pin 1 (near top right on schematic), from that node it is on both sides of C26 and then will die at the master if it's turned down.
I don't hear the noise at any other point. Thought IC1 was the culprit since it seems to originate there (no noise on pin 2), but I replaced that, then I replaced R9, then C26, then R59... now I am pretty much stumped.
I deox'd the pot with no change, rotating it does not seem to have any affect on the noise.
Any help would be greatly appreciated.
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