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Hi.. I took a picture of my ST-70. There is some white residue under one of the black capacitors.. Is this a sign of leakage? Everything seems to sound ok / its holds bias too.
jason
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I would replace it, along with all original caps.
I would tend to think not. I believe those are paper capacitors, so I don't see what there would be to leak out. Besides, in your photo there appears to be a little of the same whitish stuff under a couple of resistors to the left - some kind of powdery substance that just got onto the board? If the amp holds steady bias, you should be fine.
Edits: 10/16/14
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