On 7/21/2014 5:37 AM, Ian White wrote:
That same Wikipedia article quotes 10^-7 to 10^-10 torr as being typical
for vacuum tubes. This is consistent with a value of 10^-8 that I'd
heard from another source.
It is also consistent with John's comment that pressures higher than
about 10^-7 torr will lead to problems with arcing, while anything lower
Although we're talking 30 years ago and techniques we used have likely
changed, anything beyond 1 X 10^-7 was very difficult to acquire, time
consuming, and required gold O-rings
Any volatiles were a disaster and only a few of us were allowed to work
on the equipment.
73
Roger (K8RI).
than 10^-10 requires special techniques that are time-consuming,
expensive and not suited to mass production.
<snip a whole bunch>
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