>
>
>
>
>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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