On Tue, 23 May 2006, Dave Tweed wrote:

> No, it's just ordinary fluorescence in the glass. If you think about it
> for two seconds, you'll realize that there's no way that the voltages
> used in tube amplifiers could produce relativistic particles.

Relativistic particles no, but X rays yes and electron beams strong 
enough to destroy the glass sometimes (if faulty or such).

Peter
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