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Classification- Globe-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, solid plate or mesh plate triode. Application -Audio amplifier Class A Service, Radio Amplifier Class B Service. Oscillater Class C Service. Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1 and 2.

Nominal operating conditions and parameters Filament voltage* ………………………………………………………… 4.5V Nominal filament current …………………………………………………1.2A Plate voltage ………………………………………………………………  300V Grid voltage** ……………………………………………………………… -24V Plate current ………………………………………………………………   15mA Amplification factor …………………………………………………………7.3 Grid current ………………………………………………………………… 0.05 μ A Plate resistance …………………………………………………………… 5.0 k *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 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage ………………………………………………… 400 V Maximum plate dissipation …………………………………………… 14 W Maximum plate current ………………………………………………… 50mA