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For intermittent:
1. Make sure the printed circuit grounds are tight; 1/4 hex heads in the corners.
2. Make sure the tube sockets are OK. The holes sometimes get oversize. Pinch them back with a very sharp tool or replace the socket if you're looking for work.
3. The discriminator cans go bad. It should be buzz clean. If it will not adjust out, the can is probably bad.
4. Per above, a plastic tuning tool is essential.
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