[Amps] Tetrodes

[R@contesting.com]

On Jul 12, 2005, at 7:44 AM, Peter Chadwick wrote:

> Additionally, some tubes (the old 35T comes to mind) have tantalum 
> anodes.
> Tantalum has the property of absorbing gas when it gets hot, unlike 
> most
> materials. So tantalum anodes are designed to run hot - in the case of 
> the
> 35T, so hot that you could see the filament through the plate with the 
> grid
> casting a shadow on the plate. 35T's used a special glass called Nonex 
> to
> stand the heat.
>
> If you get a plate to screen arc, I don't see how you can have anything
> other than negative screen current. Or has Kirchoff been rewritten?

Peter -- It sounds as if Ian is mixing hole movement in a P-type 
crystal lattice with what goes on in a vacuum.
>
> 73
>
> Peter G3RZP
>
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org