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[Amps] 813's.. Parasitic suppressor's

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Subject: [Amps] 813's.. Parasitic suppressor's
From: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 12 Apr 2010 03:35:19 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Somebody asked a while back  abt the need for parasitic suppressors'  on a GG- 
813 amp.  A buddy
had one blow up on his  2 x 813 amp last yr.. across  town.  he tossed both the 
blown one.. and also
the remaining one.  Amp runs just fine with NO suppressors.   Another fellow  
runs a 4 x 813  amp,
again with no suppressors.   The tubes all balance out too..equal glow.  I'd 
try it with it with no suppressors
1st.... then if you do have stability problems.. then add them. 

If the screen and control grids are well grnded [via strap] to chassis... you 
won't have stability problems. 
I have had  813's  with as high as 3 kv on em, no load... yrs ago, with no 
stability problems,  but that amp
did have suppressors in it   [2 x 813's in GG]  [80-10m].   That was back in 
1975.   It's  a pretty stable tube.

Later... Jim   VE7RF
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