Tube Driver.

Specification and max ratings:

Filament Voltage 6.3-12 V

Filament Current 300-150 mA

Plate Voltage (max) 330 V

Plate Current (max) 6 mA

Plate Dissipation (max) 1.1 W

Screen Voltage (max) --- V

Screen Current (max) --- A

Screen Dissipation (max) --- W