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RE: GZ32 for 5U4?

Yes
you can swap those tubes and use a GZ32 or 5AS4 for a 5U4 and even some of the RCA 5U4GB have 5AS4 written on them also. Basically you look at two things when choosing rectifier.
One is,how much filament current does it draw?
Two, does your subbed rectifier have a enough current capability to feed the circuit its being used in?
Three,how much voltage drop does it have for your intended use?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken


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