Sophia Electric 300B 2.5V Vacuum Tube Specification

Filament voltage	*2.5V
Nominal filament current	2.5A
Plate voltage	300V
Grid voltage (AC filament)	**61V
Grid voltage (DC filament)	***58V
Plate current	60mA
Plate current	62.5 mA
Grid to plate transconductance	5700 ohms
Amplification factor	3.85
Grid current	0.05 A
Plate resistance	700 ohms

 
Sophia Electric 300B mesh plate tube plate curves

Limiting Operation conditions for safe operation-nor simultaneous ratings:

Maximum plate voltage	450 volts
Maximum plate dissipation	40 watts
Maximum plate current of average tube for fixed grid bias	70 ma
Maximum plate current for manually adjusted grid or self-biasing circuit	100 ma

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