[Amps] swiatching power supply for oxide cathode filament

[Tony King - W4ZT]

I use switchers for the filament of the GS-35B and GI-7B which both have 
indirectly heated cathodes with no ill effects at all.  Be sure to use a 
separate cathode choke for the B- and the bifilar choke on the filament 
leads. Most switchers have enough adjustment to make up for slight 
voltage drop across the filament choke and connecting wiring.

73, Tony W4ZT

Ðì ÔÃ wrote:
> My next project(4X4CX250 or 2*4CX800) will begin, does any guy have this 
> experience?I know that the switching power supply can not used in 
> thoriated tungsten cathode  tube's filament.But I do not think so in 
> oxide cathode tube.Thanks i advance!
> 73! Hsu