On 9/6/09 10:04 AM, "J. Forster" <[email protected]> wrote:
> Cesium is pretty reactive and could likely be stripped off chemically and
> the CBT tube cleaned.
>
> People can make simple triodes at home (with a lot of stuff). There were
> guys 'rebuilding' CRTs in the late 50s at home. However a CBT or other
> things with electron multipliers are FAR from a simple triode. You not
> only need exquisite vacuum technique, but also to be able to activate the
> electron multiplier. These are non-trivial things to do, even for large,
> expert companies. I was told by a guy at Varian that they typically did
> three tube starts for every one delivered on image intensifiers, which
> have MCP multipliers.
>
This is true on a lot of high performance vacuum/ion devices, like
Travelling Wave Tubes. Start 10 to get 3 at the end, especially for a low
volume design; a production line doing a run of dozens might get better
yield, but there's a lot of art in the process. You can do some rework at
various points to get parts to start another, similar to what Rick described
with cutting the weld apart.
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