[Hallicrafters] High line voltage

[john]

Regardless of the specification for the radio, running high filament 
voltage is without question, one of primary ways to prematurely kill a 
tube. The other is forcing the tube to run hotter.

There's no rocket science and no debate...running high filament voltage 
WILL reduce your tube lifetime.

Do I care on a 6AU6...probably not, but I sure do on my 3-500Zs and 572Bs.

John K5MO



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