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Originally Posted by John Folsom
Reece, thanks. The touchy part is getting the transformer apart to remove the built in caps.
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If the two wafers are held together with a nut and screw, you should be able to remove the nut and screw and be able to access the mica cap wafer. I've been able to do this, and I just used a scribe tool to scratch away the migration paths between silvered cap areas. Keep track of which way the mica wafer was in there (which side was top, and orientation. So you can get it back in again. If you are successful, you may not even have to touch the alignment.
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Sometimes they don't show the problem until they have been used a few minutes. I just did a job on an RCA AM/FM chassis, replaced all paper/electrolytic caps, powered it up and it worked great, after about 1/2 hour audio gets noisy and then disappears and it is the bad mica cap problem showing up.
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I had an Emerson AA5 that drove me nuts back in high school with this symptom. Did a recap, no good. Ended up tossing it, before I learned about silver mica disease,