Classification- It is a Twin triode. It is a nine golden pins tube. Oxide coated 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 connections to the base terminals are shown in Figures 1, and 2.
Fig 1 Fig 2 Nominal operating conditions and parameters Heater voltage ……………………………………………………………… 12.6V Heater current ……………………………………………………………… 0.15A Plate voltage ………………………………………………………………… 250V Grid voltage ………………………………………………………………… -8.5V Plater resistance …………………………………………………………… 7.7kohms Plate current ………………………………………………………………… 10.5mA Amplification factor …………………………………………………………… 17 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 3Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage ………………………………………………… 300V Maximum Grid voltage ………………………………………………… -50V Maximum Grid voltage ………………………………………………… 0V Maximum Power of plate ……………………………………………… 1.0W
