At your risk.
They can be used to make a very sensitive microphone booster front end amplifier.
Or for example an active electric bass DI box.
See previous posts, Pleiades V6 with CV2269 electrometer electron tube.
Other use is:
The Victoreen ionizing radiation meter:
https://www.orau.org/ptp/Library/cdv/victor717-1.pdf
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