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Classification- Dome-type bulb of glass, filametary of carbennation Th-w a copper ceramic base with four-prong bayonet golden pins, carbon plate triode. Application -Audio power amplifier Class A or Class B or Class C. 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 Filament voltage ................................... 10V Nominal filament current ...................  3.2A Plate voltage ......................................... 1250V Grid voltage ........................................  -70V Plate current .........................................100mA Amplification factor ............................. 12 Load resistance ................................   7 k Output power ........................................10W Grid to plate transconductance ....... 3.8mA / V Suggest Operating conditions and parameters Class A power amplifier of single tube (A-F) Plate voltage 750 1000 1250 V Grid voltage -46 -61 -80 V Load resistance 8.8 7.6 9.2 kohms Plate current 34 53 60 mA Signal voltage(pk) 41 56 75 V Plate resistance 4.4 3.8 3.6 kohms Output power 5.6 12 19.7 W Class B power amplifier of push-pull (A-F) Plate voltage 1000 1250 V Grid voltage -72 -95 V Load resistance 6.9 9 k Plate current(0 single) 20 20 mA Plate current(max single) 320 320 mA Signal Voltage(pk) 380 410 V Output power 200 260 W Class B power amplifier of single tube(modulate coefficient shall be 1) (R-F) Plate voltage 1000 1250 V Grid voltage -72 -95 V Plate current 130 106 mA Signal Voltage(pk) 125 125 V Output power 40 42 W Grid current(approx) 5 1 mA Grid power(input)(approx) 10 7.5 W Class C power amplifier of single trbe(max modulate coefficient shall be 1) Plate voltage 750 1000 V Grid voltage -200 -260 V Plate current 150 150 mA Signal Voltage(pk) 350 410 V Output power 65 100 W Grid current (approx) 35 35 mA Grid power (input)(approx) 12 14 W 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 Class ClassA(A-F) A push-pull Class B(A-F) Class B(R-F) Class C 　 Maximum plate voltage 1250 1250 1250 1000 V Maximum plate dissipation 75 100 100 67 W maximum plate current (max sig. Per tube) 　 175 150 175 mA maximum Grid current 　 　 　 50 mA maximum plate dissipation(in)     　 175 W max Grid voltage     　 -400 V