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6159 is a smaller transmitting beam tetrode tube, which was used in pairs within high frequency transmitters of 100 W output. It is direct replacement of the QE05/40H tube. New in box. Manufacturer: RCA, USA. British company Teonex was not a manufacturer, but a rebranding group purchasing a lot of new old stock tubes from different worldwide manufacturers and selling them under the Teonex label. All of the available tubes are tested.