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 -Voice frequency and carrier-frequency amplifier. Other applications where small power output are required. 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 ……………………………………………………………… 4.5V Nominal filament current …………………………………………………… 1.0A Plate voltage ………………………………………………………………… 160V Grid voltage ………………………………………………………………… -12V Plate resistance ………………………………………………………… 5.3kohms Plate current ………………………………………………………………… 9.9mA Amplification factor ………………………………………………………… 6.2 *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 volts Maximum plate current …………………………………………………… 15mA
