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Old 21st Sep 2019, 1:55 am   #24
G8UWM-MildMartin
Heptode
 
Join Date: Jan 2004
Location: Stockport, Greater Manchester, UK.
Posts: 748
Default Re: Regentone A133 HT smoothing capacitors, V4 cathode resistor

Since you have a new EL41 coming, there's not so much to lose by giving it the same treatment as with UL41s. A search here will give details of gas hob ignition sparks, and I've had success with clearing leakage similar to yours (that I was thinking about leaving as it wasn't that bad) with 1000V from an insulation tester between grid and cathode, giving a very satisfying internal flash and it then testing like new on a valve tester (AVO VCM Mk1).
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