[Amps] parasitic suppressor voodoo

[Gary Schafer]

Hi Alek,

If you have not already done so, read Rich Measures page on designing
amplifiers. Yes he talks about "nichrome" but the info is good.

http://www.somis.org/D-amplifiers3.html

scroll down to VHF Stability.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Alek Petkovic
> Sent: Thursday, July 15, 2010 5:30 PM
> To: DF3KV; amps at contesting.com
> Subject: Re: [Amps] parasitic suppressor voodoo
> 
> At 09:27 PM 15/07/2010, DF3KV wrote:
> >Parasitic suppressors should be designed for the circuit which needs it.
> 
> 
> 
> 
> 
> OK. Just a simple question from down under.
> 
> Who, among all the subscribers on this list, knows how to do that?
> 
> I'm not talking about cut and try methods. I'm
> talking about mathematics and tube spec sheets
> and parasitic frequencies etc etc. I have NEVER
> seen anything, anywhere, which gives the designer
> or builder of an amplifier, the tools or formulas to work this stuff out.
> 
> Time and time again, we hear this Nichrome stuff
> raised and time and time again, the two camps
> slug it out and time and time again, nobody wins.
> 
> I don't wish to align with any side here. My question is genuine.
> 
> How would I design a parasitic suppressor from
> scratch? What formulas would I use to calculate
> the L, R for a particular tube or a particular rf deck layout?
> 
> Don't tell me stuff like "four turns and 50 ohms
> worked for me." I am talking science and that
> sort of approach is NOT scientific. Gimme calculations. Somebody must
> know.
> 
> 73 and thanks,
> Alek. VK6APK
> 
> 
> 
> >The parasitics frequencies vary with tube selection and amp layout.
> >Most of the time I don´t even need one.
> >
> >
> >73
> >Peter
> >
> >-----Original Message-----
> >From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> >Behalf Of Randy Pence
> >Sent: Donnerstag, 15. Juli 2010 14:10
> >To: amps at contesting.com
> >Subject: [Amps] parasitic suppressor voodoo
> >
> >Can someone explain the difference between the Parasitic Suppressors **
> that
> >Rich Measures sells compared to the ones Jeff Weinberg sold.
> >
> >--
> >Randy Pence
> >N4JZY
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>  From sunny Binningup, Western Australia
> 
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
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> 
> 
> 
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