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Classification- It is a beam pentode. Dome-type bulb of glass, copper ceramic base with eight golden pins, oxide coated cathode of indirect heated, Carbon Plate. Application -Audio amplifier of power. 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 ……………………………………………………………… 1.6A Plate voltage …………………………………………………………………250V Grid 2 voltage …………………………………………………………… … 250V Grid 1 voltage ………………………………………………………………  -15V Plater resistance …………………………………………………………    12k Plate current …………………………………………………………………140mA Grid 2 current (max) …………………………………………………………7mA Amplification factor …………………………………………………………  8 Mutual Conductance ……………………………………………………      11.5mA/V 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 ………………………………………………… 600V Maximum Grid 2 Voltage ………………………………………………  500V Maximum Grid 1 voltage ………………………………………………   -200V Maximum Power of plate ………………………………………………  42W Maximum Power of Grid 2 ……………………………………………    8W Maximum Power of plate and Grid 2 …………………………………  46W Maximun plate Current …………………………………………………  230mA