On 25 Apr 2007 at 16:17, Mike Saculla wrote:
< snip >
> I once overheard someone on the air say that vacuum tubes
> have a vacuum of about 70 Torr (mm of mercury), which is not "high" vacuum.
> But I don't know how accurate that 70 Torr figure is.
>
> I work with high vacuum systems, not vacuum tubes, so I am not sure of those
> details.
70 Torr is certainly NOT high vacuum. I'd be very surprised if the
pressure inside a good vacuum tube isn't more like 10^-7 Torr or so!
But I could be wrong (for a change 8>)
73,
George T. Daughters, K6GT
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