Quote:
Originally Posted by David G4EBT
The twin unit smoothing/reservoir capacitors are very reliable, reform well and are rarely the source of hum, almost invariably caused by the EL84 output valve.
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David had a typo, it should of course be UL41 valve. (hope that's OK David)
Remove all pin 3 and 4 connections on this valve base, Bush liked using them as make do tag strips but it causes problems with some UL41 valves