|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