12-20-2013, 11:47 AM
Your 80 is gassy. Another indication is to push the filament voltage up to 6 and then 7.5 volts on you Hickok. The emissions will increase but so will the gas glow. If this proves to be true for that tube, use it for display only.
Yes, a rectifier must be in the green on a Hickok 600A.
Yes, a rectifier must be in the green on a Hickok 600A.