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

Nominal operating conditions and parameters

Heater voltage.....................6.3V/12.6 V
Heater current.....................0.3A/0.15 A
Plate voltage........................250 V
Grid voltage.........................－2 V
Plate resistance................62.5 k
Plate current......................1.2 mA
Amplification factor...........100

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.....................30 V
Maximum Grid voltage..................... -50 V
Maximum Grid voltage..................... 0 V
Maximum Power of plate.................1.2 W