Re: GZ34 data sheet discrepency?
I wonder if this could be a case of "rationalisation" by the manufacturer - different and upgraded internals (shared with some other more-popular valve?) but still badged the same as the original version?
In the same way as the original 5Y3 was directly heated but later started appearing as an indirectly-heated version with the cathodes tied to one filament-pin.
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