[Amps] Use of Regulated DC on Power Tubes Filaments

[Ron]

I remember doing life tests in filaments of lamps and when DC was used ,
it caused plating of the filament material from one side to the other
essentially plating the filament away on one side and causing an early
failure.
Use AC.
---
Ron


"Smith, Dave" wrote:
> 
> Friends,
> 
> What are the pro's / con's regarding using regulated DC to supply filament
> voltage for a PA in cathode driven, AB2 configuration? I need 7.5 volts @
> 51.5 amps and have available a HP regulated supply that is 0 - 10VDC @ 100
> amps. I would isolate the both neg and pos sides from chassis ground.
> 
> Thanks for your input.
> 
> Dave / W6TE
> 
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