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GU-81M

PENTODE

The GU-81M pentode is used in self-excited oscillation and power amplification circuits of RF equipment.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass, with base.
Height: at most 260 mm.
Diameter: at most 202 mm.
Mass: at most 1 kg.

gu-81m(1)00061.jpg
1, 2 - cathode; 3 - grid 1; 4 - grid 2; 5 - cathode centre tap; 6, C3 - grid 3; A - anode

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C -10 to +55
Relative humidity at up to +25 °C, % 98

BASIC DATA
Electrical Parameters
Filament voltage V 12.6
Filament current, A, at most 11
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 600 V, anode current 200 mA), mA/V 4.5-6.5
Gain coefficient (grid 1 -grid 2) (at anode voltage 2 kV, grid 2 voltages 600 and 500 V, anode current 200 mA) 2.5-4
Bias voltage (at anode voltage 2 kV, grid 2 voltage 600 V), V 116-160
Interelectrode capacitance, pF:
input 25-32
output 21-26
grid 1-anode, at most 0.1
grid 1-grid 3 1-4
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 700

Limit Operating Values
Filament voltage, V 11.6-13.4
Anode voltage, V:
at frequencies not above 6 MHz 3
at frequencies not above 24 MHz 2.5
at frequencies not above 50 MHz 1.5
Grid 2 voltage, V 600
Anode current (average value), A 0.6
Grid 1 current (average value), A 0.02
Grid 2 current (average value), A 0.2
Dissipation, W:
anode 450
anode (momentary dissipation) 600
grid 2 120
grid 1 10
Envelope temperature, °C 350

gu-81m(3)00081.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 0.5kV;
(Pa max)

gu-81m(3)00082.jpg
Averaged Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 0.5kV

gu-81m(3)00083.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 0.6kV

gu-81m(3)00084.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 0.5kV

gu-81m(4)00091.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 0.6kV

gu-81m(4)00092.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ua = 2.5kV;
_____ anode-grid;
_ _ _ grid 2