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Re: [Amps] Glitch resistor

To: Dick NY1E <>
Subject: Re: [Amps] Glitch resistor
From: Vic Rosenthal <>
Date: Mon, 14 Nov 2016 19:55:10 +0200
List-post: <">>
As I understand it, the glitch resistor is not supposed to be a fuse. In the 
event of a flashover, it is supposed to limit the current so that components 
(even the tube) won't be damaged in the time before the primary fuse in the 
power supply opens. 
I believe that 10 ohms is on the low side and 25 ohms would be better. During 
normal operation it will dissipate I**2 * R watts, so 25 or 35 watts should be 
adequate. A vitreous enameled resistor is recommended to take the short but 
heavy overload in the event of a flashover. Those rectangular wirewound 
resistors containing sand are NOT recommended.
Also it's important to have correctly sized primary fuses.

Vic 4X6GP

> On 13 Nov 2016, at 03:52, Dick NY1E <> wrote:
> My SB220 stopped operating, with no plate current and pegging the grid meter 
> after a bright light out of the rear fan grill. It seems an added glitch 
> resistor opened, 10 ohm 10 watts doesn't seem big enough. did it do its job 
> and sacrifice itself? The resistor looks fine no burns or anything. Should it 
> be bigger or keep this size as a fuse?de Dick NY1E
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