03-03-2018, 11:33 PM
I haven't checked the schematic but if the indicator needle points to the center always at the same line voltage set by the pot (and hence the filament voltage), then it shouldn't matter if the tube is in as when it's in, the voltage will drop and the needle reading goes down, and then when you adjust it back to the center again, the voltage should go back to the same value.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
