> Yup. FYI, the GZ-34 is the European designation for the 5AR4, and the
> GZ-37 is a 5U4.

That's not entirely true. The GZ37 and 5U4 have almost the same specs but
these are two different tubes. The GZ36 = CV837, but it is not the same as
a 5U4 although it can be used to replace it.

Jim

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