GK-71 (ГК-71) Power Pentode

GK-71 (ГК-71) POWER RF PENTODE
GK-71 (ГК-71) is a somewhat similar (but not the same) to the famous 813 by RCA. There was another soviet replica of RCA 813 - GU-13.
GK-71 (ГК-71) has a narrower frequency range and a slightly less gain than, say, GU-13 tube, but there are some advantages - it was dirt-cheap and has a terrific endurance (resultant of massive graphite anode block and durable heavy-duty construction).
Possible, GK-71 was the most popular power tube in the AM pirate's anti-society. I'm not quite sure, I have no statistical data of pirate's preferences, but all of my unsocial friends was a GK-71 boosters.
At the other hand, this power pentode was a "Full Legal Limit" tube to the HAM Radio amateurs and one GK-71 final have to be approved without power measuring. I've heard rumours about the one GK-71 tube multy-megawatters, asbestos glove for quick tube replacement etcetera, but reality is slightly less wondrous - 350 watts from one tube without overheating, up to 450-500 watts if you are out-and-outer.

CHARACTERISTICS
Filament Voltage20 voltsGK-71
Filament Current3 amps.GK-71 Tube Pinout
Input Capacitance18 mmfd.
Output Capacitance17 mmfd.
Grid to Plate Capacitance0.15 mmfd.
Maximum Plate Dissipation125 watts
Maximum Screen Dissipation25 watts
Frequency Rangeup to 20 Mc
Height195 mm.
Diameter68 mm.

GK-71 Pins
GK-71 Socket

APPLIED CW CHARACTERISTICS
class+plate+screenbiasIa0 Ia ~V in~P inRa Po Ri
C1.5kV400V-120V-260mA240V2.5W3.2k275W-
B1.25kV400V-120V-270mA240V3W2.7k230W-

APPLIED SSB CHARACTERISTICS
class+plate+screenbiasIa0 Ia ~V in~P inRa Po Ri
AB11.5kV600V-105V70mA160mA105V05.7k140W-
B1.5kV400V-65V60mA200mA125V0.4W4.4k200W-

APPLIED SSB CHARACTERISTICS (Grounded Grids)
class+plate+screenbiasIa0 Ia ~V in~P inRa Po Ri
Bgg2kV0018mA220mA133V36W5.5k300W350




GK-71 (ГК-71) POWER RF PENTODE
Authentic xUSSR GK-71 (ГК-71) HF Power Pentode

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