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
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