[Amps] Choosing a Plate Transformer

[KB0NLY]

Me too!

73,

Scott


----- Original Message ----- 
From: "Jeff Blaine" <keepwalking188 at yahoo.com>
To: "RICHARD GEORGE" <k6kwq at msn.com>
Cc: <amps at contesting.com>; "KB0NLY" <kb0nly at mchsi.com>
Sent: Tuesday, March 10, 2009 11:02 AM
Subject: Re: [Amps] Choosing a Plate Transformer


>
> 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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>>
>


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