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@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Jeff Blaine
> Sent: Tuesday, March 10, 2009 12:03 PM
> To: RICHARD GEORGE
> Cc: amps@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@mchsi.com>
> > To: <amps@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
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|