[Amps] D.C. on filaments of GS-35B?

[Nuno Lopes]

Hi,

Me too.

I would like to know the pros and cons of running the filaments of an GS-35
with Vdc , you can get small power supply of 15, 24 or 30Vdc at 10A, by
around $30 some with 3 way out, you can run 1 or 2 tubes, and relays,
separately this is far more cheap than making one or to Vac transformer(s)
for the tubes and Vdc for the relays.

Any commends?

2015-01-30 22:31 GMT+00:00 nemo zilch <nemozilch at gmail.com>:

> Seems to me it would be good to use a dc supply for the filament of the
> GS35B amp I am building.  Easier to build an effective soft start circuit,
>  easy to build the supply. I understand why dc is not good for tubes which
> do not have cathodes, the effective bias is different from one side of the
> filament to the other.  Thus emission does not take place uniformly along
> the filament.
>
> But is there any reason not to use dc on an indirectly heated tube such as
> the GS35B?  Advice appreciated.
>
> Bob W4AOS
>
>
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*73  Nuno   CT2IRY*