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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. Dimensions-Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, 2 and 3. Nominal operating conditions and parameters Filament voltage...............................5 V or 2.5V Nominal filament current................1.2A or 2.5A Plate voltage.....................................300V Grid voltage...................................－58 V Plate current.....................................60 mA Amplification factor.........................3.85 Grid to plate transconductance ...5.7mA/V Grid current......................................0.05 μA Plate resistance..............................700 ohm *Alternating-current filament supply or Direct-current filament supply. **Alternating-current filament supply is used. The grid and plate returns should be connected to a center tap on the secondary of the filament transformer. ***Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament. Characteristics-Average characteristics Figure 4. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply. Fig.4 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