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Filament voltage .. AC/DC?


AC filaments if directly heated use a centertap on the transformer to complete the cathode circuit. They have extremely tiny amounts of hum.

I've heard DC will wear out a filament quicker due to more emission on one side of the filament. Not sure though.

Standard practice on most tubes is to use AC and sleep at night like a baby.
 
So a YC156 for example could use a center tapped xformer, center tap to ground, a pair (or single) bifilar choke, and delta fed Rf through the caps.
 
Good links. I saw another guy who was using 2 bifilars in parallel and it had me confused for a second, but it just dawned on me that he was increasing the amperage capacity.
 

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