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For one
thing, you need to be somewhat careful about handling the
resistor, because fingerprints are conductive and might short
out the resistor. It's not a super-big deal; you just build
the circuit and /then/ clean off the fingerprints with alcohol.
There are /some/ tubes that use a regulated (electronic) voltage
supply and then regulate the current using a grid, but I'm not
sure how widely deployed they are.