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[AMPS] a sticky issue.

To: <amps@contesting.com>
Subject: [AMPS] a sticky issue.
From: 2@vc.net (measures)
Date: Sat, 14 Oct 2000 19:32:22 -0700
>
>> Seems that issue is not that effective resistivity of nichrome increases
>> with decreasing frequency - I don't think anybody is arguing that. What is
>> evident is that the effective series resistance of the nichrome suppressor
>> is higher than conventional suppressor at low frequencies. From what I can
>> see, this seems to be the basic tradeoff  between the nichrome suppressors
>> and the conventional suppressors. If I am recalling the test data
>> correctly, the nichrome suppressor has higher losses at moderate VHF
>> frequencies (50 to 100 MHz) - a good thing, at the expense of higher
>> losses in the HF frequency range (a bad thing). As the frequency increases
>> further the the two suppressors start to converge as the inductive
>> reactance of the nichrome suppressor starts to dominate over the
>> resistance of the wire. No rocket science here. 
>
>The AL80B becomes unstable, with no suppressor, at around 180 
>MHz or so depending on the tube socket and lead length.
>
>Suppressor operation at 150-200 MHz is all that matters in that 
>case.
>
>The Measures' suppressor Wes tested was NOT the suppressor 
>Rich sells. 

>Wes duplicated the AL-80 suppressor out of nichrome 
>and measured it. The actual suppressor Rich sells has lower Rp 
>than the stock suppressor.

Here we go again.  Rich does not sell parasitic suppressors.  He sells 
material to build them.  //  Tom -- does lower Rp mean more VHF gain or 
less?
>
>When the "production" nichrome suppressor is installed in the 
>anode system, anode system Q increases except at HF and lower 
>VHF....where it decreases (and where you don't want it to 
>decrease).

zzzzzzz

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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