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GK-71
Glass generator pentode.
Designed to amplify and generate high frequency vibrations.
Decoration - glass, with a plinth.
Working position - vertical, anode up.
Cooling is natural.
Durability not less than 1000 hours.
Weight no more than 320 g.
Main technical parameters of GK-71:
at Un = 20 V, Uа = 1500 V, Uc2 = 400 V, Uс3 = 50 V, Ia = 250 mA
Filament current: 3 ± 0.3 A
Reverse current of the 1st grid (at Iа = 83 mA): no more than 30 μA
Anode current (at Uс = 350 V and Uс1 = 50 V): not less than 35 mA
Emission current (at U = 180 V): no more than 900 mA
Slope (at Uа = 600 V, Iа = 150 and 200 mA): 4.2 ± 0.7 mA / V
Gain on the 1st grid relative to the 2nd (at Uа = 750 V, Uc2 = 300 V, Iа = 130 mA): 5 ± 1
Oscillatory power (at negative voltage of the 1st grid 100 V, excitation voltage 215 V): not less than 250 W
Oscillatory power (at Un = 18 V, negative voltage of the 1st grid 100 V, excitation voltage 215 V, Ia = 250 mA and frequency 20 MHz): not less than 200 W
Insulation resistance between electrodes, not less: 20 MOhm
Interelectrode capacitances, pF:
- grid-cathode 18 ± 4
- anode-cathode 17 ± 7
- mesh anode 0.15
Limiting performance characteristics of GK-71:
Filament voltage: 18-22 V
Anode voltage: 1500 V
2nd grid voltage: 400V
Power dissipated by anode: 125 W
Power dissipated by the 2nd grid: 25 W
Working frequency: 20 MHz
Ambient operating temperature range: from -60 to +70 С