[Amps] Choosing a Plate Transformer

[Jeff Blaine]

Hi Richard,

I'm curious what you base that on?

73/jeff/ac0c


RICHARD GEORGE wrote:
> !500 watts input to a single GI7B.  That is going to be awfull hard on the 
> tube.
>
>
> ----- Original Message ----- 
> From: "KB0NLY" <kb0nly at mchsi.com>
> To: <amps at contesting.com>
> Sent: Tuesday, March 10, 2009 8:30 AM
> Subject: [Amps] Choosing a Plate Transformer
>
>
> I'm thinking about slowly scrounging parts to build another amp in the 
> future, it will be a ways off so in no hurry, and i was wondering how one 
> chooses a plate transformer.
>
> I know the minimum i'm shooting for, 2500v 600mA.  This will be to run a 
> single GI7B.
>
> I was thinking about using those Far Circuit boards for constructing the 
> doubler and rectifier.  It looks like the average factor is 2.8.  Which 
> means for 2500v i would need a transformer with a secondary of at least 893 
> volts (rounded up).  But what should i do on the current capacity side, 
> should i look for something as high as a 1 amp transformer?  Most of the 
> ones i am finding on eBay for example are 500mA or smaller.  I could 
> probably get away with .500 mA.
>
> The question is, does one loose ampacity with the double circuit, or does 
> the current remain constant?  I can't seem to find any notes in the handbook 
> articles on the subject of choosing a transformer.  This is why the last amp 
> i built i used a donor FL-2100B so i wouldn't have all the questions on 
> constructing the power supply.  But the next time around i want to build the 
> power supply from scratch and learn more about HV supplies!
>
> The 6M amp i just built is working great by the way.  It will do 500w but i 
> keep it around 400w.  I checked into a net this weekend that a nearby club 
> holds on 6m, they were suprised how loud i was as i'm usually the most 
> distant and sometimes one of the weekest for them to hear.
>
> 73,
>
> Scott KBØNLY
>
> www.kb0nly.net
>
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