[Amps] Grid fuses (was: Life and gain of 3-500Z)

[R L Measures]

On Jul 21, 2006, at 6:30 AM, Bill Turner wrote:

> ORIGINAL MESSAGE:
>
> On Thu, 20 Jul 2006 13:13:23 -0400, you wrote:
>
>
>> Not quite Bill.
>>
>> The very reason a tube flashes over in the first place is
>> the anode has a conductive path to the closest element
>> inside the tube, the grid.
>>
>> If we allow the grid to rise by virtue of a fuse we then
>> have the problem of the grid no longer shielding the cathode
>> from the fault. We have a grid firmly nailed to the anode,
>> and all the energy from the anode is available to dump
>> across the small grid to cathode gap inside the tube.
>>
>> There isn't any way that is even remotely a good idea.
>>
>> 73 Tom
>>
>
> ------------ REPLY SEPARATOR ------------
>
> I think we're talking about two different problems here:
>
> 1. Excessive grid current, without internal arcing.
> 2. Internal arcing.

Indeed, Bill.  To me, Tom's injection of arcing is beginning to smell  
of red herring.
>
> A fuse, resistor or solid state protective circuit is not going to be
> much good against #2, but should help #1, I would think. Am I wrong?

No

>
> Bill, W6WRT
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R L MEASURES, AG6K. 805-386-3734
r at somis.org