Bottlehead Kits > Mainline

6J5 to 6C45P?

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currly30:
Would I be able to use the 6J5 tubes with an adapter in place of the 6C45P?

Paul Birkeland:
Most definitely not a good idea!

currly30:
Why is that? Doesn't it have the same voltage and current?

Doc B.:
Very different tube with much less gain, much less max plate dissipation  and much higher output impedance. The most feasible substitute for a 6C45pi is a WE437A. IME the 6C45pi sounds just as good as the 437A and even a bit better in some applications.

Paul Birkeland:
You'd also be running at nearly maximum cathode current, which would also likely shorten the lifetime of a 6J5.

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