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The GU-11B tetrode is used in self-excited RF oscillator circuits with no external feedback, operating in continuous-wave or pulsed mode with anode modulation.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic with ring leads of cathode,
heater and grid.
Cooling: forced air.
Height: at most 88.5 mm.
Diameter: at most 45 mm.
Mass: at most 120g.


Vibration loads:
frequencies, Hz 5-600
acceleration, m/s² 59
Multiple impacts with acceleration, m/s² 343
Ambient temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

Electrical Parameters
Heater voltage, V 12.6
Heater current, A 0.75-0.88
Mutual conductance (at anode voltage 400 V, grid voltage change 0.5 V, anode current 15 mA), mA/V 8-12
Penetration factor (at anode voltage change to 0.4 kV, anode current 15 mA), % 0.7-1.5
Operating point (negative grid voltage at anode voltage 400 V, anode current 15 mA), V 4.5-1
Interelectrode capacitance, pF:
input 9-13
output 0.11-0.21
transfer 2-3.3
Warm up time (at anode voltage 600 V), s, at most 60
Output power in CW operation, W:
at wavelength 14 cm, at least 8
at wavelength 38 cm, at least 20
Output power over 500 h of service (at wavelength 38 cm), W, at least 16

Limit Operating Values
Heater voltage, V 12-13.2
Anode voltage, kV:
DC 0.8
DC with cold cathode 1
peak (with pulse duration about 5 µs) 2
Peak grid voltage (with pulse duration about 5 µs), V -150 to +50
Cathode current, A:
r.m.s. value 0.15
peak value (with pulse duration about 5 µs) 1.5
Dissipation, W:
with forced cooling 80
with no forced cooling 20
grid 2
Wavelength,cm 11-100
Temperature, °C:
anode heat sink 200
cathode lead 100
grid lead 120
Resistance in grid circuit, kOm 10

Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V