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The 810 is a high-power transmitting triode with a maximum plate dissipation of 150 watts (ICAS) and a mu of 36. The 810 is designed for use as a radio-frequency amplifier and class B modulator. Because of its high perveance, it can be operated at high plate efficiency with low driving power and relatively low plate voltage. For example, two 810's in class C telegraph service (ICAS) will take a plate input of 1240 watts and require only 24 watts of driving power. In class B modulator service (ICAS) two tubes are capable of plate-modulating 100% an r-f amplifier having a power input of nearly one and one-half kilowatts! Grid-bias requirements are unusually low. At a plate voltage of 2000 volts, a grid bias of only -45 volts will protect the tube against overloading caused by loss of grid excitation.
The filament of the 810 is shielded at each end. This construction increases power output by eliminating losses from bulb bombardment and stray electrons. This tube has a graphite anode, specially processed to insure high thermal radiation and a minimum of gas. Plate and grid leads are brought out to rugged terminals at the top and side of the bulb, respectively. This design provides very low lead inductance and permits compact circuit layout for h-f installations. The 810 can be operated at frequencies as high as 30 Mc with maximum ratings. |
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