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5bc3 why such a weird tube
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05-22-2012, 12:54 AM
Electronic M
M is for Memory
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 15,414
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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