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Classification- It is a Twin triode. Dome-type bulb of glass, copper ceramic base with eight golden pins. 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 Heater current ……………………………………………………………… 0.6A Plate voltage …………………………………………………………………250V Grid voltage ………………………………………………………………… -8V Plater resistance …………………………………………………………    7.7k Plate current …………………………………………………………………9mA Amplification factor ………………………………………………………… 20 Heater-cathode voltage …………………………………………………… 90V 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