It is an electron tube low noise booster amplifier. Since the current consumption is typically only 150mA (the deliberately reduced heater current of EF183) and the voltage required is less than 4V, solar cell operation is possible.
For example a small solar panel can be on top of the octagon box.
A special arrangement can be made to charge the internal batteries even when there is no direct sunlight. But attention should be paid to protective circuits for not overcharging the batteries.
Reference:
Pleiades V6 schematic
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