An American 5Z3, including RCA, is electrically equivalent to a 5U4G. Be alert to inadvertently acquiring a Chinese 5Z3P, which is unsuitable.
I have 2 RCA Nos 5z3.
They should be good for at least 30 years. If you're lucky, you'll get 40 years out of the 2 tubes. Those well made OS rectifiers last and last.
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