Thread: 5bc3 why such a weird tube
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Old 05-22-2012, 12:54 AM
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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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