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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 kohms 

 

*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.

 

 

Limiting Operation Conditions for Safe Nor simultaneous ratings

Maximum plate voltage ………………………………………………… 400 volts

Maximum plate dissipation …………………………………………… 14 watts

Maximum plate current ………………………………………………… 50mA