Nominal operating conditions and parameters:

Filament voltage

*5.0V

Nominal filament current

1.2A

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 ľA

Plate resistance

700 ohms

Sophia Electric™ 300B mesh 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