Even the corners of metal connecting lugs and terminals in the
high voltage departments in amplifiers are potential lightning rods.
A sharp metal corner or edge is a place where a corona discharge
can take place, be it a filter cap lead or a diode lead; whatever.
Good building craft addresses sharp edges and corners.
A good but unsightly prophylaxis is to use some
high-voltage dope on connections. Even the small amount of
insulation afforded may well fend off the corona seeking an arc
path to a grounded or otherwise opposing polarity.
Another solution is to find some Electroshield 7.5KV
"cloth." This stuff may be attached with some dabs of
RTV on to chassis walls nearby HV connections where
an arc might occur.
Hal Mandel
W4HBM
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Ian White GM3SEK
Sent: Wednesday, March 21, 2007 2:57 PM
To: amps@contesting.com
Subject: Re: [Amps] Surge resistor
Gary Schafer wrote:
>
>Dare we say that a glitch can also be caused by a parasitic
>oscillation.
>
Along with several other well-documented possibilities, including
sporadic releases of gas into the vacuum inside the tube, microscopic
'whiskers' of metal inside the tube, stray hairs or insects outside the
tube, line voltage surges, intermittent antenna connections, lightning
protectors arcing over, photoelectrons, cosmic rays; and my all-time
favourite: "spurious renegade primary and secondary electrons".
That last quote was delivered with all the authority of the RCA Tube
Division!
The point they were making was: we don't know all the causes, but we can
protect our amplifiers against the *effects*.
--
73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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