I just opened & removed the GK 700RB's FP PCB from the chassis, as the input jack was broken, and found every FP jack just caked with that blue potassium carbonate corrosion (I think that's what it is) that we're used to seeing on old alkaline batteries that have been left in place too long. I've never seen this on an amplifier though. I hadn't thought to stock vinegar here in the shop, as I read that's one of the solutions to clean that off......I think.
I looked at the rear panel speaker jacks, and didn't see that condition on those two jacks. And, I don't see evidence of this corrosion anywhere else on the Front Panel PCB. Before I opened it up, I wasn't sure if I had a replacement jack for that, but know I don't have four of them.
What would cause this? Anyone else seen this?
I looked at the rear panel speaker jacks, and didn't see that condition on those two jacks. And, I don't see evidence of this corrosion anywhere else on the Front Panel PCB. Before I opened it up, I wasn't sure if I had a replacement jack for that, but know I don't have four of them.
What would cause this? Anyone else seen this?
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