Re: Testing 813's.
That's very kind of you Andy. I'm always reticent to entrust anything like this to the post. IIRC, I have three new looking 813s, two Canadian Marconi and one that's JAN US marked mil spec. I think I have a fourth somewhere where the soldered top cap has fallen off the main pin coming out of the top of the valve! Anyway, let me see if I can even find them.
Mike
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