The GK71 tube is 125 watt pentode with a maximum frequency of 20 MHz. Made for a military equipment. NEW, NOS and never used before!
Name: GK71 / ГК71 / ГК-71;
Cathode type: tugsten, carbidized, direct heating;
Application field: Oscillation and power amplification;
Brief application: amplification, oscillation;
Envelope: glass with base;
Cooling method: air;
Dimensions: 195mm x 68mm;
Filament voltage: 20 V;
Filament current: 2.7 - 3.5 A;
Normal anode voltage: 1,5 kV;
Mutual conductance: 3.1 to 4.9 mA/V;
Gain coefficient: 4 to 6;
Output power: 125 W;
Maximum anode voltage: 2 kV;
Maximum operating frequency: 20 MHz.