>> From: km1h@juno.com (km1h @ juno.com)
>> Subject: Re: [AMPS] Grid capacitors
To: <amps@contesting.com>
>> Date: Thu, 10 Jul 97 21:55:58 +0000
>
>Carl,
>
>I know you get upset with technical explanations, but let
>me try to explain this. I'll try to keep it simple.
...snip...
>All the stuff you and Rich blame on "parasitics" is mostly arcs due
>to outgassing and seal leakage. ...
Funny thing that the alleged Rauchian gas disappears by the time that the
kaput tubes are removed from the amplifier and tested with a
high-potential tester. I tested a pair of kaput 3-500Zs for Rod, W7OM,
this morning. Both appeared to have been damaged by VHF parasitic
oscillations. However, the vacuums tested good. At least one of the two
appeared to have a bent filament--like the one on page 15 in the Sept.
1990 *QST* article "Parasitics Revisited". .
Rich---
R. L. Measures, 805-386-3734, AG6K
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