20 Jan
2004
20 Jan
'04
10:32 p.m.
How so? Are flight times between cathode and anode
shorter than
transit times between emitter and collector? Or is there some other
effect going on that I've missed?
That is basically it - flying electrons don't have other junk to bump into,
like they do in solid state.
This transit time problem pretty much killed standard tubes in the microwave
region - to get the things to work properly, the cathode-grid-plate
spacing had to be extremely small. Small, however, is not good for other
reasons, namely power and capacitance.
William Donzelli
aw288(a)osfn.org