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Originally Posted by Chad Hauris
I think this is a series string filament set which does not use controlled heater warm up time tubes so there is a surge of current in some tubes (such as the CRT) when the set is turned on and is hard on the CRT filament...replacing the CRT filament in the string with a resistor and providing a seperate trans for the CRT filament removes the surge problem from it.
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Another possibility would be to use a pair of high powered zener diodes (in series, cathode to cathode) rated for around 8V (this value selected to pass the peak voltage of 6.3VRMS = 8v +0.7V diode drop of the other zener in forward conduction mode). So when the set is turned on, the diodes will clamp the heater voltage to around 8V equivalent RMS, which a heater is designed to take for short periods of time. It is a *heater*, not a filament, yes?
You can hide the diodes below the chassis.