National/Greenstone 4CX20000D

National/Greenstone 4CX20000D
4CX20000D / 9015 is a ceramic/metal VHF tetrode intended for use as an RF amplifier up to 110 MHz. It is especially recommended for use in the 88-108 MHz FM band. It has an electromechanical structure that provides high RF operating efficiency and low RF losses. 4CX20000D has a gain of up to 20 dB in FM broadcast service. The anode is rated for 20 kilowatts of dissipation with forced-air cooling and incorporates a highly efficient cooler of new design, which significantly reduces air pressure and flow requirements and produces low acoustic noise levels