> 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.
73, Colin K7FM
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