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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 ........................6.3V/12.6V Heater current ........................0.6A/0.3A Plate voltage ...........................250V Grid voltage ............................-8V Plater resistance ...................7.7k Plate current ...........................9mA Amplification factor ................20 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 simultaneous ratings Maximum plate voltage ...................300 V Maximum Grid voltage ....................-50V Maximum Grid voltage ....................0V Maximum Power of plate ...............2.5W