07-20-2009, 06:48 AM
Rich;
I can't see much advantage in designing an amplifier power supply to operate AC tube heaters from DC, there may be something to gain by designing recording equipment that way but in most cases proper lead dress and the use of shielded cables solves that problem inside an audio amp. The truth be told I have had more problems with my gear picking, and or radiating noise through the assorted jacks and cables tying the inputs and outputs of the equipment together then from tube filament wiring. Most of the manufactures of the amplifier that I have twisted the filament leads together and oriented then as close to the chassis as possible, in addition to using shielded cables where needed.
Best Regards
Arran
I can't see much advantage in designing an amplifier power supply to operate AC tube heaters from DC, there may be something to gain by designing recording equipment that way but in most cases proper lead dress and the use of shielded cables solves that problem inside an audio amp. The truth be told I have had more problems with my gear picking, and or radiating noise through the assorted jacks and cables tying the inputs and outputs of the equipment together then from tube filament wiring. Most of the manufactures of the amplifier that I have twisted the filament leads together and oriented then as close to the chassis as possible, in addition to using shielded cables where needed.
Best Regards
Arran
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