Quote:
Originally Posted by old_coot88
Have you substituted the HV (EHT) rectifier tube? It is the most frequent cause of blooming.
Even if it tests 'good' on a tester, it can still fail in operation. The only valid test is subbing with a known good tube.
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Well at this moment I don't have a spare one but the DY87 in the set seems to be OK ALMOST LOOKS LIKE NEW ...
it probably has bad EHT regulation,what components can I check ???
Also where can I found some lecture on how these things work,so I would know a bit more what I'm doing ??