SV: [AMPS] SB-220 Glitch Resistor ???

[Peter Chadwick]

Tom,

>On the other hand if the grid in a triode is floated through a 
>resistance any HV faults in the tube would be passed right along to 
>the filament/cathode circuit, yet that is supposed to be a "good 
>idea".
>
>Odd.

You're forgetting that the only HV faults that ever appear are because of
parasitics!

	73

Peter G3RZP


> ----------
> From: 	Tom Rauch[SMTP:w8ji@contesting.com]
> Reply To: 	W8JI@contesting.com
> Sent: 	30 November 2000 12:41
> To: 	g3sek@ifwtech.com
> Cc: 	amps@contesting.com
> Subject: 	Re: SV: [AMPS] SB-220 Glitch Resistor ???
> 
> 
> 
> 
> Date sent:      	Thu, 30 Nov 2000 09:43:08 +0000
> To:             	amps@contesting.com
> From:           	"Ian White, G3SEK" <G3SEK@ifwtech.com>
> Send reply to:  	"Ian White, G3SEK" <g3sek@ifwtech.com>
> Subject:        	Re: SV: [AMPS] SB-220 Glitch Resistor ???
> 
> > 
> > Wilbert Knol wrote:
> > >
> > >
> > >> With the glitch R in the negative return, the cathode circuitry may be
> > >> driven to several kV by a B+ to chassis arc.  
> > >
> > >Good point.
> > >
> > >I don't like the idea of most of the HT appearing across the filament
> > >transformer secondary...
> > >
> > Does it?
> 
> The same fellow who always proclaims a "glitch resistor" in the grid 
> is a good idea, now finds fault with a resistor in the B-.
> 
> A glitch resistor in the B- only would cause the negative terminal at 
> the HV rectifier and filter cap junction to go up towards HV + rail, 
> everything on the chassis and cathode side of the resistor could be 
> fully clamped to ground and remain so just as a resistor in the HV 
> line would allow. It would make no difference at all!!!
> 
> On the other hand if the grid in a triode is floated through a 
> resistance any HV faults in the tube would be passed right along to 
> the filament/cathode circuit, yet that is supposed to be a "good 
> idea".
> 
> Odd.
> 
> 
> 73, Tom W8JI
> w8ji@contesting.com
> 
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