GK-71

The GK-71 tube is a generator pentode designed to amplify power and generate high-frequency oscillations at frequencies up to 20MHz. It is applied to work of radio engineering devices of general purpose. Working position – vertical. Cathode tungsten thoriated carbide direct heating.

Technical specifications (at Un=20V, Ua=1500V, Uc2=400V, Uc3=50V, Ia=250mA):

• Filament current: 3 ± 0.3A
• Reverse current of the 1st grid (at Ia=83mA): no more than 30μA
• Anode current (at Uc=350V and Uc1=50V): not less than 35mA
• Emission current (at U=180V): no more than 900mA
• Slope (at Uа= 600V, Iа=150 and 200mA): 4.2 ± 0.7mA/V
• Gain coefficient for the 1st grid relative to the 2nd (at Ua=750V, Uc2=300V, Ia=130mA): 5 ± 1
• Oscillatory power (with negative voltage of the 1st grid 100V, excitation voltage 215V): not less than 250W
• Oscillatory power (at Un=18V, negative voltage of the 1st grid 100V, excitation voltage 215V,
• Ia=250mA and frequency 20MHz): not less than 200W
• Insulation resistance between electrodes, not less than: 20MOhm

Limiting performance:

• Filament voltage: 20 ± 2V
• Anode voltage: 1500V
• 2nd Grid Voltage: 400V
• Anode power dissipation: 125W
• Power dissipated by the 2nd grid: 25W
• Operating frequency: 20MHz

Service life not less than 1000 hours.