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[AMPS] SB-1000 mods?

To: <>
Subject: [AMPS] SB-1000 mods?
From: Mike" < (Mike)
Date: Tue, 11 Sep 2001 21:09:53 -0700
Hmmm, if there are no good rules of thumb and no peak current/energy ratings 
for anode
supply components, how does one go about sizing the glitch resistor? I guess 
you start
out small and keep making it bigger until parts stop failing, or perhaps start 
out big and
make it smaller until things start failing :):)

BTW, speaking of grid components, how come Drake grounds the grids on the L-7 
a parallel combination of RF chokes and capacitors? Seems like one could 
achieve the 
same goal by grounding the grids directly with a low inductance strap right to 
the chassis.

73 de Mike, W4EF..............

----- Original Message ----- 
From: "Tom Rauch" <>
To: <>; "Ian White, G3SEK" <>; "Mike" 
Sent: Tuesday, September 11, 2001 5:44 PM
Subject: Re: [AMPS] SB-1000 mods?

> > Wouldn't the 4CX5000 tend to have a larger filter capacitor, and thus
> > a bit more energy to dump, or is peak current the real concern? With
> The 4 by 5 will have higher voltage, but the tube will easily handle 
> more impact than a small tube. Every system needs to be looked 
> at in view of the total system.   
> > Rich's example of the 10 ohm glitch R in the SB-220, and assuming some
> > stray R in caps and chokes, you are still talking about a peak current
> > pulse on the order of 180 amps!! Seems like an awful lot of current.
> > What can the average plate choke withstand??
> There is no average plate choke. That is the problem with rules of 
> thumb.
> The most important thing is to not put a glitch resistor in the grid. It 
> belongs in the HV lead.
> 73, Tom W8JI
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