[Amps] Choosing a Plate Transformer

[KB0NLY]

But I don't have 1500w input?

73,

Scott


----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Jeff Blaine'" <keepwalking188 at yahoo.com>; "'RICHARD GEORGE'" 
<k6kwq at msn.com>
Cc: <amps at contesting.com>
Sent: Tuesday, March 10, 2009 12:41 PM
Subject: Re: [Amps] Choosing a Plate Transformer


I think that the GI7B has a 350 watt plate dissipation. 1500 watts input at
60% efficiency = 900 watts out. 1500 -900 = 600 watts of plate dissipation!

The tube will cook.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Jeff Blaine
> Sent: Tuesday, March 10, 2009 12:03 PM
> To: RICHARD GEORGE
> Cc: amps at contesting.com
> 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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