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Classification--It is a Twin triode. It is a nine pins tube.oxide coated cathode of indirect heated.
Application--It intended for use a voltage amplifier or Phase inuerter.
Dimensions--Dimensions, outline diagrams of the tube and bases and the arrangement of electrode commections to the arrangement of electrode connections to the base terminals are shown in Figures 1 and 2 .

Nominal operating conditions and parameters

Heater voltage.......................2.6 V
Heater current.......................0.15 A
Plate voltage..........................250 V
Grid voltage...........................－8.5 V
Plate resistance...................7.7 k
Plate current.........................10.5 mA
Amplification factor..............17

Characteristics-Average characteristics

Figure 3. shown typical curves of plate currents as a function of grid voltage for several values of plate voltages.

Fig.3

Limiting Operation Conditions for Safe Nor-nor simultaneous ratings

Maximum plate voltage.................. 300 V
Maximum Grid voltage....................-50 V
Maximum Grid voltage....................0 V
Maximum Power of plate................2.75 W