At your risk. Take all safety precautions. Any voltage or current can be dangerous. A fuse must be used in series with any battery for fire hazard safety.
This is the datasheet:
https://frank.pocnet.net/sheets/049/1/1LG5.pdf
Advantages:
Very low heater supply power.
Remote cutoff or vari mu or vari μ (actually in Hellenic language μ is pronounced mee with short ee ie phonetics code "mi". Same as π, pronounced πι, "pi" and not pie).
Suppressor grid not connected to cathode.
See also DL97 on a more recent today's post:
https://euroelectron.blogspot.com/2019/08/df97-electron-tube-as-battery-powered.html
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