CLASSIFICATION
Dome-type or Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet gold pins , oxide coated filamentary, solid plate, mesh plate, cabon plate triode.
APPLICATION
Audio frequency amplifier where power outputs of approximately 8.5watts or less is required at relatively low plate voltages.
Nominal operating conditions and parameters
Filament voltage* …………………………………………………………… 5V or 2.5V
Nominal filament current …………………………………………………… 1.2A or 2.4A
Plate voltage ………………………………………………………………… 300V
Grid voltage** ……………………………………………………………… -58V
Plate current ………………………………………………………………… 60mA
Amplification factor …………………………………………………………… 3.85
Grid to plate transconductance …………………………………………… 5.7mA / V
Grid current ………………………………………………………………… 0.05 μ A
Plate resistance …………………………………………………………… 700 ohms
Limiting Operation Conditions for Safe Nor-nor Simultaneous Ratings
Maximum plate voltage……………………………………………………450 volts
Maximum plate dissipation…………………………………………………40 watts
Maximum plate current of average tube for fixed gird bias………………….70mA
Maximum plate current of manually adjusted gird or self-biasing circuit.…100mA