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Re: [Amps] Utilization of old TV transformer

To: Amps reflector <amps@contesting.com>
Subject: Re: [Amps] Utilization of old TV transformer
From: Vic K2VCO <vic@rakefet.com>
Date: Fri, 19 Mar 2010 14:49:52 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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/
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