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A 12LP4 draws 600 ma (0.6A) at 6.3V I would connect a 0.6A load to the heater pins and measure the voltage... do not apply 15V to the heater if the tube!
jr
PS: A 10 ohm resistor 5W should serve well
Edit add: I see that E-M had a good idea about using a small tube as a load
Last edited by jr_tech; 03-27-2015 at 04:29 PM.
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