Amps
[Top] [All Lists]

Re: [Amps] Choosing a Plate Transformer

To: "'KB0NLY'" <kb0nly@mchsi.com>, "'Jeff Blaine'" <keepwalking188@yahoo.com>, "'RICHARD GEORGE'" <k6kwq@msn.com>
Subject: Re: [Amps] Choosing a Plate Transformer
From: "Gary Schafer" <garyschafer@comcast.net>
Reply-to: garyschafer@comcast.net
Date: Tue, 10 Mar 2009 14:26:07 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
> I know the minimum i'm shooting for, 2500v 600mA.  This will be to run
> a
> > > single GI7B

2500 volts at 600 ma = 1500 watts input. You said it!  :>)

73
Gary  K4FMX

> -----Original Message-----
> From: KB0NLY [mailto:kb0nly@mchsi.com]
> Sent: Tuesday, March 10, 2009 1:50 PM
> To: garyschafer@comcast.net; 'Jeff Blaine'; 'RICHARD GEORGE'
> Cc: amps@contesting.com
> Subject: Re: [Amps] Choosing a Plate Transformer
> 
> But I don't have 1500w input?
> 
> 73,
> 
> Scott
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer@comcast.net>
> To: "'Jeff Blaine'" <keepwalking188@yahoo.com>; "'RICHARD GEORGE'"
> <k6kwq@msn.com>
> Cc: <amps@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@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
> 
> 
> --------------------------------------------------------------------------
> ------
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.9/1993 - Release Date: 03/10/09
> 07:19:00


_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>