This lamp is selected on reasons of deriving of output power up to 1000W at small overall dimensions. The lamp is included under the schema with earthed grids, its(her) high steepness therefore will not be utillized. It is connected that the booster was engineered under the transceiver with a transistor output stage by power 100...120W. In sample alternative of actuation with the communal cathode the condition AB will be utillized, the output power compounds 600W. This condition can be recommended, if the output power of the transceiver compounds 25...30W. The coefficient of performance of such booster is low-level (standing current - up to 300mA), that is connected to supply of a linear condition of beefing-up. Lacks of this alternative, apart from a low coefficient of performance - necessity hardly to stabilize stresses screen and controlling of grids. If the transceiver with output power not less than 70 will be utillized... 80W, it is expedient to include a lamp under the schema with communal grids. In such schema the distortings, introduced by a stage, depend on a choice of an operating point on the performance of a lamp a little.