Tubes Asylum

RE: How important it is to have the voltage of the filament being elevated ?

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In Reply to: RE: How important it is to have the voltage of the filament being elevated ? posted by akltam on March 24, 2014 at 07:44:24

I am not quite sure what you are hoping to accomplish by 'elevating' the heater/filament voltage-
If the voltage is elevated too much(more than ~5%?) it will shorten the life of the element/tube....
Happy listening

Follow Ups:

He means he wants to raise the DC potential of the filament circuit relative to ground... - JJ Triode 14:22:38 03/24/14 (0)
�not increase the voltage difference between the two ends of each filament. Likewise, I think by "across" Mike Samra means you connect one resistor from each side of the filament circuit to a DC voltage, to create a virtual center tap. If the filaments are referenced directly to ground, the maximum cathode to filament voltage rating might be exceeded in some circuits, so you raise the filament average potential to some higher DC value, closer to where the tube cathodes are running. This can arise e.g. if you have a cathode follower, where the cathode may ride at a couple of hundred volts DC.

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