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#4
03-25-2005, 06:28 AM
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Heater current is the determining factor if it will be used in a series string...if the current of the tube is not the same as all the others you will have trouble getting the tubes to light. However if the set uses a 6.3 volt parallel heater circuit, the tube can draw any current it wants to as long as it's rated at 6.3 volts and the power supply can supply the filament current.
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