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 2.102D_01_en Nominal operating conditions and parameters Filament voltage* ……………………………………………………………… 2.1V Nominal filament current …………………………………………………… 1.0A Plate voltage ………………………………………………………………… 160V Grid voltage ………………………………………………………………… -3V Plate resistance ………………………………………………………… 8.1kohms 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.102D_02 Fig 3 Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage …………………………………………………… 190 volts Maximum plate current …………………………………………………… 1.5mA