[Amps] FW: GS35b Bias

[Gary Schafer]

Go here if you haven't already.
http://bias.gs35b.com/

73
Gary K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at 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 at msn.com
> To: jan at 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 at contesting.com [mailto:amps-bounces at contesting.com]
> Namens
> > MIKE DURKIN
> > Verzonden: dinsdag 9 maart 2010 0:57
> > Aan: ka4inm at 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 at 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!
> 
> 
> 
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