Ambient temperature, °C -10 to +55.

Relative humidity at up to +25 °C, % 98.

Electrical Parameters:

- Heater voltage, V 12,6;

- Heater current, A 0,6-0,85;

- Mutual conductance (at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage increment 5 V, anode current 50 mA), mA/V 3-5,5;

- Bias voltage at operating point, V 25-55;

- Penetration factor of grid 1 relative to grid 2, % 16-26.

Interelectrode capacitance, pF:

- input, at most 13-15;

- output, at most 10,3;

- transfer, at most 0,1.

Output power, W, max.:

- at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage -100 V, anode current, at - most 150 mA 55;

- over 1,750 h of service 40.