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

[Bill Turner]

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 
>

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I think we're talking about two different problems here:

1. Excessive grid current, without internal arcing.
2. Internal arcing.

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?

Bill, W6WRT