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NOS vacuum tube with grey plates and bottom halo getter
Tested 3400/3400 on Hickok 752A, where minimum is 1600/1600
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Tested 2040/2440 on Hickok 752A, where the minimum is 1600/1600Dual Triode passed Leakage Test..
Tested 3200/2900 on Hickok 752A, where the minimum is 1600/1600Dual Triode passed Leakage Test..
Perfectly balanced at 2200/2200 µmhos on a Hickok 752A where
minimum is 1600/1600
Closely matched pair of NOS tubes, tested 1000/825 µmhos and 1025/825 µmhos on Hickok 752A..