8V lead acid. (A fuse in series should always be used for safety).
The battery should be in the same closer to minimize voltage drop.
It may this be possible to use no cathode bias resistor making the amplifier a true only 1 electron tube per channel and nothing else.
This is the schematic link:
http://euroelectron.blogspot.com/2014/07/pleiades-electra-schematics.html
Pleiades schematics or concepts are open source
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