[Amps] Utilization of old TV transformer

[Vic K2VCO]

On 3/19/2010 2:52 PM, Zeitler, Lane LT, FST-1 wrote:
> With this level of Ep I would consider 811As.

I'm replying to this particular message, but I want to thank everyone else who responded 
to my query, on and off list.

The consensus of opinion is:

1) Forget the tripler circuit unless I want to use only one 813.
2) Watch the insulation of the transformer ct if using a bridge or doubler.
3) The 1700 volts or so that I would get from the doubler is not really enough to properly 
utilize 813's.

One guy said that the transformer capacity is only 197 VA; but he is ignoring the duty 
cycle -- in the TV set it was 100% -- and the fact that there is another 116 VA in unused 
filament windings. So the primary is good for 313 VA continuous. I was doubling that to 
allow for the duty cycle. I agree that this is skating on the edge (standard ham practice, 
right?)

However... the 813's deserve better. So I think I am going to look around for a 
transformer that I can get 2400 - 2800 V at 350 - 400 mA from.
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/