If that condition isn't met, you have a "gas
filled tube"
-- something you occasionally want, but not very often.
That describes a thyratron, it behaves like a thyristor, a
very useful device.
Take a look at power transistors sometime. Some come
in "hockey
puck" packages, which describes not just the shape but also the
size.
These big power transistors are actually lots of small transistors
in parallel.
Lee.
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