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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, mesh plate ,cabon plate triode.
Application-Audio frequency amplifier where power outputs of approximately 3.5 watts 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 and 3.

Nominal operating conditions and parameters

Filament voltage……………………………………………2.5 V
Nominal filament current………………………………… 2.5A
Plate voltage………………………………………………   250V
Grid voltage………………………………………………    －45 V
Plate current………………………………………………   60 mA
Plate current………………………………………………   62.5 mA
Amplification factor………………………………………   4.2
Grid to plate transconductance…………………………  5.25mA/V
Grid current………………………………………………    0.05 μA
Plate resistance……………………………………………800 ohms
Load resistance……………………………………………2.5 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
voltage…………………………………………………… 300 V
Maximum plate dissipation…………………………… 15 W