[Amps] AC or DC better for indirectly heated cathodes?

[Steve Thompson]

On Wednesday 19 November 2003 13:09, A.J Moss wrote:
snip
>     If I were to make a floating adjustable regulated DC supply, I could
> use an ordinary pot to control the heater volts, meter it, and have a fine
> adjustment to within ca. 1V either way to set optimum heater volts. I could
> also then add a current limiting option on the regulator to limit inrush at
> switch-on
>
>     Are there benefits, advantages, or just risks of using such a scheme?
> Constant unvarying power at the heaters seems good, but is 'less' 'more' to
> use the cliche.
Repays itself in no time at all if you're ever going to operate portable.

Steve