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Classification- Dome-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, carbon plate triode.

 

Application -Audio frequency amplifier where power outputs of approximately 22.5watts 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.

 

 

Nominal operating conditions and parameters

Filament voltage* ………………………………………………………… 5V

Nominal filament current …………………………………………… …… 2.4A

Plate voltage ………………………………………………………………… 400V

Grid voltage** ……………………………………………………………… -70V

Plate current ………………………………………………………………… 120mA

Amplification factor …………………………………………………………… 3.85

Grid to plate transconductance …………………………………………… 8.5mA / V

Grid current ………………………………………………………………… 0.05 μ A

Plate resistance ………………………………………………………… …450 ohms

Load resistance …………………………………………………………… 2.0 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 ………………………………………………… 450 volts

Maximum plate dissipation …………………………………………… 80 watts