yea the w7zt ... uses the tl431 and a PNP pass ...
> > Yea, G3SEK uses a TL431 and a PNP pass transistor .... Im just trying to
> > get by on whats already there ... Does any one else have comments about
> > Noise from the LM317t compared to the TL431 ???
> From: garyschafer@comcast.net
> To: patriot121@msn.com; amps@contesting.com
> Subject: RE: [Amps] FW: GS35b Bias
> Date: Tue, 9 Mar 2010 18:20:18 -0500
>
> Go here if you haven't already.
> http://bias.gs35b.com/
>
> 73
> Gary K4FMX
>
> > -----Original Message-----
> > From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> > On Behalf Of MIKE DURKIN
> > Sent: Tuesday, March 09, 2010 6:02 PM
> > To: amps fourm
> > Subject: [Amps] FW: GS35b Bias
> >
> >
> >
> >
> >
> >
> > From: patriot121@msn.com
> > To: jan@on6zg.be
> > Subject: RE: [Amps] GS35b Bias
> > Date: Tue, 9 Mar 2010 15:01:59 -0800
> >
> >
> >
> > Yea, G3SEK uses a TL431 and a PNP pass transistor .... Im just trying to
> > get by on whats already there ... Does any one else have comments about
> > Noise from the LM317t compared to the TL431 ???
> >
> > Mike
> > KC7NOA
> >
> > > snip> Subject: RE: [Amps] GS35b Bias
> > > Date: Tue, 9 Mar 2010 21:54:25 +0100
> > >
> > > I'm using a tip147 or BD equivalent. You can also check G3SEK triode
> > board
> > >
> > > 73 Jan ON6ZG
> > >
> > > -----Oorspronkelijk bericht-----
> > > Van: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> > Namens
> > > MIKE DURKIN
> > > Verzonden: dinsdag 9 maart 2010 0:57
> > > Aan: ka4inm@tampabay.rr.com; amps fourm
> > > Onderwerp: Re: [Amps] GS35b Bias
> > >
> > >
> > > thats right ... my amp does not have a PNP, only NPN trans good to
> > 1200v@10A
> > > .... i want to replace the minum of parts ...
> > >
> > > You dont see an improvement ?? I was leaning towards a variable Bias
> > with a
> > > LM317t and a NPN pass transistor .. simply because its what i have ...
> > and
> > > im trying not to buy anything.
> > >
> > > Mike
> > > KC7NOA
> > > > >
> > > > Hi MIKE DURKIN:
> > > >
> > > > > ok, I made a quick draw of what im wanting to do .. basically
> > replace
> > > > > the Zener in the all black drawing .. I forgot to add a Blocking
> > diode
> > > > > in series ok the 1k resistor that's tied to the NPN transistor ..
> > > >
> > > > I see no PNP, but if the circuit on the left is the original it is
> > an
> > > "amplified Zener."
> > > > The LM317 will generate much more noise and not be any improvement
> > that I
> > > can see.
> > > > --
> > > > Ron KA4INM - I'm proud to be Chuck's pop!
> >
> >
> >
> > Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up
> > now.
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> > http://clk.atdmt.com/GBL/go/201469230/direct/01/
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