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

[measures]

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>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-.
>
The only  AMPS person who has mentioned putting a glitch R in the grid is 
Mr. Rauch.  

>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.
>
Not quite as odd as cold gettering and invisable barnacles.  
>
end

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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