Technical characteristics and electrical parameters: Filament voltage 6.3 ± 0.6 V Filament current 760 ± 60 mA Nominal anode voltage (constant) 250 V Anode voltage limit 300 V Anode current 48 ± 8 mA Cathode current limit 65 mA The second grid voltage is rated (constant) 250 V Grid voltage second limit (constant) 300 V The second grid current is not more than 7 mA Power dissipated by the anode, limiting 14 W Power dissipated by the second grid, limiting 2 W Maximum voltage between cathode and heater (constant) 100 V Slope 11.3 mA / V The gain in triode connection is about 20 Internal resistance 30 kOhm Resistance in the cathode circuit for automatic bias 120 Ohm Input capacitance about 11 pF Output capacitance about 7 pF Pass-through capacitance about 0.2 pF Glass miniature decoration