Quote:
Originally Posted by earlyfilm
If your Muntz has a solid state rectifier, especially if it has been upgraded from selenium, then the capacitors may temporarily exceed their voltage ratings during tube warm up. This will shorten their life.
Tube rectifiers like the 5U4 & 5Y3 intentionally have a controlled filament warm up to prevent this from happening.
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Um.. not to be picayunish
but 5U4 and 5Y3 are direct-filament types that warm up quickly and put full B+ onto the filters before the rest of the tubes begin conducting and pull the B+ down.
There are other 5V rectifier types that have indirectly heated cathodes and give controlled warmup. 5V4, 5CG4 etc. come to mind.