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
>> 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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