[AMPS] SB-1000 mods?

Mike Mike" <W4EF@dellroy.com
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 thru
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" <w8ji@akorn.net>
To: <amps@contesting.com>; "Ian White, G3SEK" <g3sek@ifwtech.com>; "Mike" <W4EF@dellroy.com>
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
> W8JI@contesting.com 
> 
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