Transmitting pentode GK-71 (ГК-71) with direct heating, anode dissipation 125 W and anode voltage of 1,5 kV. Maximum operating frequency is 20 MHz. Mass of the tube is around 250 g (not more than 320 g). Dimensions in mm: not more than 195 x 68. All of the tubes are in original packaging. GK-71 is currently used in amplifiers and other DIY projects (like VTTC).