W8JI does make arguments with supporting analysis and clearly designed
experiments. More than you see from some others.
The amp you mention being tamed by the suppressor proves that THAT
particular suppressor helped THAT particular amp. Nothing more.
David Goncalves
W1EUJ
On Wed, Feb 11, 2009 at 10:22 AM, Carl <km1h@jeremy.mv.com> wrote:
> And here is a third comment on the subject.
>
> BOTH are partially wrong, Measures for his ideas about parasitics being
> the cause of everything bad that happens.
>
> Long before W8JI came along and declared himself the messiah of all
> things some commercial and military amps used nichrome or mumetal as the
> suppressor inductance. If you go back to the 90's archives I mentioned
> it a few times and then gave up as a few people will not accept anyones
> ideas but their own.
>
> I personally saw the results, as strictly an observer, of a 3CV1000
> military amp prototype that defied all attempts to stabilize until a
> 1/2" wide ribbon of Mumetal was wound around the big Globar. It then
> passed all tests 2-30 mHz using a reactive dummy load to simulate VSWR's
> of up to 4.5:1 of either sign.
>
> So, before anyone goes off half cocked and believing everything they
> read on the Internet please consider the above.
>
> Carl
> KM1H
>
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Vic K2VCO" <vic@rakefet.com>
> To: <Gudguyham@aol.com>
> Cc: <Amps@contesting.com>; <Gary@doctorgary.net>
> Sent: Tuesday, February 10, 2009 11:15 PM
> Subject: Re: [Amps] Nichrome wire for suppressors
>
>
> > Gudguyham@aol.com wrote:
> >>
> >> In a message dated 2/10/2009 10:36:09 P.M. Eastern Standard Time,
> >> Gary@doctorgary.net writes:
> >>
> >> Anyone have a suggestion where I can find quick & easy find about a
> >> foot of nichrome wire to be used in parasitic suppre
> >>
> >>
> >> Does anyone dare answer this?
> >
> > Sure. The use of nichrome wire in VHF parasitic suppressors is
> > controversial. A very good
> > explanation of VHF stability in vacuum tube amplifiers which argues
> > *against* the use of
> > nichrome wire can be found at <http://w8ji.com/vhf_stability.htm>.
> >
> > If you want to see the opposite side, look at Rich measures' site,
> > <http://www.somis.org/>. He also will sell you a kit including wire
> > and the appropriate
> > solder and flux to make a nichrome suppressor.
> >
> > Personally, I think that although many of Measures' ideas are
> > useful -- I like his fast
> > t/r switching circuit -- he is wrong about the nichrome and W8JI is
> > right.
> >
> > That wasn't bad, was it?
> > --
> > 73,
> > Vic, K2VCO
> > Fresno CA
> > http://www.qsl.net/k2vco
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
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>
--
David Goncalves
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