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The GU-34B tetrode is used for wideband power amplification at frequencies up to 250 MHz in RF equipment.

Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 94 mm.
Mass: at most 1 kg.

KP - cathode and heater; P - heater; C1 - grid 1; C2 - grid 2: A - anode

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

Electrical Parameters
Heater voltage, V 12.6
Heater current, A 3.3-4
Mutual conductance (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 500 mA), mA/V 22-34
Gain coefficient (grid 1 -grid 2, at anode voltage 1 kV, grid 2 voltage 400-500 V, anode current 500 mA) 19
Cutoff voltage (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 5 mA), V, at most 80
Interelectrode capacitance, pF:
input, at most 63-73
output, at most 7-11
transfer, at most 0.12
Warm up time, min, at most 2.5
Output power, W, at least 400
Output power over 1.500 h of service, W, at least 320

Limit Operating Values
Heater voltage, V 13.9
Anode voltage, kV 4-103
Grid 2 voltage, V 600
Cathode current (DC component), mA 540
Dissipation, W:
anode 500
grid 2 20
grid 1 5
Frequency, MHz 250
Temperature at anode, stem and seals, °C 150

Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 400V

Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 500V

Averaged Grid 2-Anode Characteristic Curves:
Uf= 12.6V; Ug2 = 400V

Averaged Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 500V