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To: k7fm <>
From: R L Measures <>
Date: Sun, 4 Jun 2006 22:56:27 -0700
List-post: <>
On Jun 4, 2006, at 10:52 AM, k7fm wrote:

>> Why, after you install all of the Rich Measures protection  
>> circuitry, do
>> you have to worry about arcing in the TL-922.  It would seem that  
>> bending
>> the plate is a useless act - unless there are reasons other than
>> parasitics that cause arcing.
> Phil said:
> "Several things come to mind, including:
> 1. RF cannot get to where it is normally supposed to go, i.e., a load.
> 2. RF getting into where it is normally not supposed to go, i.e.  
> bugs, dirt,
>    dust, failed components, changed values, etc.
> 3. Operator error.
> Most of these can be protected against, just like parasitics."
> Which was the point of the question.  If things other than  
> parasitics can
> cause arcing in an amplifier, it should therefore not be assumed  
> that an arc
> is caused by a parasitic - and the automatic cure for an arc, in an
> otherwise reliable amplifier, need not be the installation of nichrome
> parasitic suppressors.  If an amplifier has been absolutely  
> reliable for 10
> years, with or without a parasitic suppressor, and an arc occurs,  
> it would
> take an act of blind faith to jump to the conclusion that the  
> amplifier was
> poorly designed and needs to be modified to continue to function.

How about a 2K-4A being stable for 8-years, Colin?  My SB-220 was  
stable for two years before the VHF suppressor burned up on 40m, a  
band where the suppressor dissipation should have been under 100mW.  .
> 73,  Colin  K7FM
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