>
>Rich Measures wrote:
>>>>? the R-sups in the 922 receive cool forced air and they are virtually
>>>>HF-shorted by silver straps. Does it seem likely that lower-band RF
>>>>could damage these resistors?
>>>
>>>This brings us back to the old problem that we never know the condition
>>>of the resistor (and/or tube) immediately before it failed. Was it still
>>>like new, or had it already deteriorated way out of specification? Just
>>>because the component finally failed on 80m, it doesn't mean that all
>>>the damage was done on that band.
>>>
>>? An intermittent push-push vhf parasite is typically so brief that it
>>causes no external damage to R-sup. Instead, the damage is internal,
>>and, as such, can only be discovered with an ohmmeter. However, damage
>>from 10m fundamental energy always causes visible damage.
>>
>But that still doesn't answer the question. Nobody checks until *after*
>the amplifier fails.
>
? such a question appears to be a defensive measure.
- cheers, Ian.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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