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What is going on underneath that socket? I had a 630TS with arcing under the 1B3GT socket and ever since then I've been obsessive about cleaning everything under and around there. Also look for any sharp points -- a little solder tail, a clipped lead end, etc. If you spot a carbon track anywhere, that's a tipoff, of course.
It seems unlikely that ammonia removed an insulating coating. I'm guessing the cup & socket material are similar to Bakelite -- the material itself has insulating properties.
Couldn't hurt to clean it again in case Bob's idea is right, and the first cleaning washed gunk down into some cracks. I have used isopropyl or denatured alcohol before. Blowing it all out with compressed air sounds good, too.
How is the socket attached to the cup? Replacing a socket would be one approach if you can get the old one out.
The problem I had with a Miss America was different. The RTV coating that I applied to that flyback is holding up fine, however.
Phil Nelson
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