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Classification- Globe-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, solid plate or mesh plate triolde. Application -It intended for use as a audio frequency voltage amplifier. Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1and 2.

Nominal operating conditions and parameters Filament voltage* …………………………………………………………… 2.1V Nominal filament current ……………………………………………………1.0A Plate voltage ………………………………………………………………… 160V Grid voltage …………………………………………………………………   -3V Plate resistance …………………………………………………………       8.1k Plate current ………………………………………………………………      0.34mA Amplification factor …………………………………………………………   29.2 *Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament. 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 …………………………………………………… 190 V Maximum plate current …………………………………………………… 1.5mA