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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, 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................................................5 V
Nominal filament current.................................2.4A
Plate voltage......................................................400V
Grid voltage....................................................－70 V
Plate current......................................................120 mA
Amplification factor...........................................3.85
Grid to plate transconductance .....................8.5mA/V
Grid current........................................................0.05 μA
Plate resistance...............................................450 ohm
Load resistance...............................................2.0 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-nor simultaneous ratings

Maximum plate voltage.........................450 V
Maximum plate dissipation..................80 W