Classification- Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, mesh plate or carbon plate triode. Application -Audio frequency amplifier where power outputs of approximately 4.5watts 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 and 2.
Nominal operating conditions and parameters Filament voltage* ……………………………………………………………… 4V Nominal filament current ……………………………………………………… 1A Plate voltage ………………………………………………………………… 300V Grid voltage** ……………………………………………………………… -45V Plate current ………………………………………………………………… 50mA Impedance ………………………………………………………………… 830 ohms Amplification factor …………………………………………………………… 5.0 Mutual Conductance ……………………………………………………… 6.0mA/V Grid current ………………………………………………………………… 0.05 μ A *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 ………………………………………………… 300 volts Maximum plate dissipation …………………………………………… 15 watts
