Quote:
Originally Posted by Electronic M
I seem to recall reading that the 5AU4 was the improved higher current version of the 5U4, and that putting a 5U4 in place of a factory specified 5AU4 can shorten the life of the 5U4(but this could be me mixing things up).
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5AU4 = 5V3. A 5U4GB in its place may indeed have a short life and would probably cause the B+ to sag even while it was still "good". Conversely a 5AU4 subbed for a 5U4 type might shorten the life of the power transformer because it draws 3/4 amp more filament current.