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5U4GB - Can it be used in place of 5AR4?

Posted: Sat Jan 28, 2023 12:48 am
by j57little
I am particular to the 5U4G for two reasons:
1. The coke bottle 5U4GB looks awesome (most 5AR4's have a shorter beer can envelope)
2. I have a 90% vintage Sylvania 5U4GB that I would like to use in place of the 5AR4

Will this work? I suspect the voltage would be reduced a little when using a 5U4G instead of a 5AR4, but I don't plan to run EL34's or KT120's so I was thinking that this substitution would work.

Any thoughts are appreciated.