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The heater resistance on this tube is 3.4 ohms so I would use a 3.3ohm resistor to get a quick reference of the voltage befor plugging the tube in so the 150mv is to low 550mv would equal.55v but still full voltage for that split second I fear it wit take out the heater I only have 2 of these tubes that are good and I already burned the 3rd one I had.
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