[Amps] Nichrome wire for suppressors

[Carl]

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 at rakefet.com>
To: <Gudguyham at aol.com>
Cc: <Amps at contesting.com>; <Gary at doctorgary.net>
Sent: Tuesday, February 10, 2009 11:15 PM
Subject: Re: [Amps] Nichrome wire for suppressors


> Gudguyham at aol.com wrote:
>>
>> In a message dated 2/10/2009 10:36:09 P.M. Eastern Standard Time,
>> Gary at 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
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