New 1 pcs pentode gu-81M.

New 1 pcs pentode gu-81M.

The GU-81M pentode is used in self-excited oscillation and power amplification circuits of RF equipment.
Cathode: directly heated, carbonized thoriated tungsten.
1, 2 - cathode; 3 - grid 1; 4 - grid 2; 5 - cathode centre tap; 6, C3 - grid 3; A - anode
OPERATING ENVIRONMENTAL CONDITIONS
Relative humidity at up to +25 °C, %
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 600 V, anode current 200 mA), mA/V
Gain coefficient (grid 1 -grid 2) (at anode voltage 2 kV, grid 2 voltages 600 and 500 V, anode current 200 mA)
Bias voltage (at anode voltage 2 kV, grid 2 voltage 600 V), V
Interelectrode capacitance, pF:
Output power (at anode voltage 2 kV, grid 2 voltage 600 V, bias voltage -200 V, grid 1 drive voltage amplitude 300 V, anode current, at least 450 mA, grid 1 current at most 20 mA, grid 2 current, at most 220 mA), W, at least
at frequencies not above 6 MHz
at frequencies not above 24 MHz
at frequencies not above 50 MHz
Anode current (average value), A
Grid 1 current (average value), A
Grid 2 current (average value), A
Averaged Anode Characteristic Curves:
Averaged Grid 2-Anode Characteristic Curves:
Averaged Characteristic Curves:
Averaged Grid-Anode Characteristic Curves:
Averaged Grid-Anode Characteristic Curves:
Averaged Characteristic Curves: