Grounded Grid
This design uses a triode, the grid current drawn in this system is larger than that required for the other two basic designs. Because of this, valves such as the 4CX250B are not suitable for this circuit. This circuit design has been used at 1296 MHz using disk seal triode valves such as the 2C39A.
The grid is kept at ground, the drive is applied to the cathode through a capacitor. The heater supply must be isolated with great care from the cathodes as unlike the other designs the cathode is not connected to RF ground. The cathodes are also at a DC potential more negative than the grounded grid, and the DC supply for the valve is likely to be more complex than the supply required for the other two designs.
Read more about this topic: Valve Transmitters
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