Another thought. Could impurities introduced during manufacturing of the
different metals used in tube construction be associated with tube arcing?
Larry N5BIP
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Tom W8JI
Sent: Friday, July 28, 2006 6:53 AM
To: Amps Amps
Subject: [Amps] Arc distance
I wouldn't want people to walk away with the false idea that spacing is the
only major parameter that determines arc distance in a given dielectric
media. The shape is extremely important, as are any small sharp edges.
A blunt smooth surface for a given spacing can have several times the
voltage breakdown of a similar spacing with a sharp edge or even a very
small sharp protrusion.
People who think they can look at a complex structure and predict where it
will break down based on spacing are kidding themselves and fooling anyone
else who believes them.
I suspect the incorrect bandswitch and capacitor breakdown voltages that are
tossed out as "fact" come from looking at gaps or perhaps testing parts that
are exceptionally smooth or testing under other best-case conditions, or
maybe even just invented without any factual basis at all.
73, Tom W8JI
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