https://www.radiomuseum.org/forum/tubes_operating_without_anode_supply.html
Vacuum-tube circuits without plate supplies - Philip B. Clark
The article begins at page 192:
https://www.americanradiohistory.com/Archive-Electronics/50s/Electronics-1952-12.pdf
In fact the Pleiades V1 much be one of them as it was discovered by chance while short circuiting from load resistor to filament heater (+1.5), with the Vb battery removed, the electrometer electron tube worked to amazement and this is how the Pleiades V1 microphone headamp came to life. And showing the way for Pleiades bias too.
The link was found from:
https://parts-ring.com/starved-anode-electron-tube-practices/
By searching on google for:
Starved operation of electron tubes
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