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[Amps] 3-500Z parasitic wows

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Subject: [Amps] 3-500Z parasitic wows
From: (WA2BPE)
Date: Fri, 23 Aug 2002 12:24:28 -0400
Well, it wasn't a mismatched load and after replacing the tubes and the 
resistors, it fired up just fime.  No question that it has been a workhorse tube
for mny, mny people/years.

73,  Tom - WA2BPE

Pete Smith wrote:

> At 03:57 PM 8/22/02 -0400, WA2BPE wrote:
> >...Had this happen to me with an old SB220 destroying one tube; luckily (??),
> >they were about to be replaced anyways.  Later investigation showed that the
> >resistors in the parasitic chokes had increased between 5 & 10x their 
> >original
> >value.  I was "fortunate" - only the tube arced with no other damage.
> Which "this" is that?  A parasitic, or a random grid/filament short, or
> arcing due to a mismatched load, or a Rocky Point arc?  There are lots of
> things that can happen with a manually tuned amp, and I'd be more inclined
> to look at other things to blame besides a workhorse tube that is probably
> in more amateur amps than any other...
> 73, Pete N4ZR
> Sometimes a tower is just a tower
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