This is a Russian manufactured Triode. It comes with a very large copper anode cooler that can be removed. With air cooling, there is a 1.6kW anode dissipation limit, With liquid cooling, it is 2kW.  This is a nice valve....but if you get one new, beware. They are not aged. You must run them up properly, Heaters first, with cooling air to the seals. Say 24 hours.  When applying EHT they may initially flash over - so run them at <1kV EHT through a big resistor. Bring the volts up slowly. Leave the valve running with very low bias current via a large resistor at full EHT for many hours before using it in anger.

UA3LBD has produced a design for 2m and 70cms using this device with a smaller GH70b? (I can't read Cyrillic) triode as a driver. The amplifier also works with the GS31 and GS15 triodes. Other designs have been published in Dubus.

Here are the specifications:


Weight, KG              0.85 (2.8*)
Diameter, mm            65 (100*)
Length, mm              153 (200*)
Cooling, l/min Anode    2500 Air (2 l/min for water cooling)
Cooling, l/min Cathode  50
Cooling, l/min Grid     300
Warmup, s               180

                     Typical Operation

Anode Voltage, V        2500
Anode Current, A        0.4
Grid Voltage, V        -9
Grid Current, mA        ?
Heater Voltage, V       12.6
Cathode Current, A      2.95
Output Power, Wt        800
Amplification, mA/V     30
Cin, pF                 21
Cout, pF                0.12
Cgp,pF                  4.5

                       Maximum Rating

Anode Temp, deg.C       200
Cathode Temp deg.C      120
Anode Dissipation, Wt   2000
Anode Voltage, V        3000
Plate Current, A        1.4
Grid Dissipation, Wt    26
Grid Voltage, V        -400/+120
Grid Current, mA         ?
Heater Voltage, V      11.9-13.3
Driving Power, Wt        ?
Full Rating, MHz         1000

* - with radiator


Thanks to Wasily, RW3DR