Don't have a specification, but it would be a low value. It's designed to work with positive grid voltages.
The similarly-scaled pentode, the GK71, is rated to have a Maximum grid leakage current of 30uA, when running 83 .. 100mA in the anode - I would imagine one should work with at least that much leakage, and gas will add to it, because of the years of storage.
The similarly-scaled pentode, the GK71, is rated to have a Maximum grid leakage current of 30uA, when running 83 .. 100mA in the anode - I would imagine one should work with at least that much leakage, and gas will add to it, because of the years of storage.
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