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The GI-21 B (GI-210) triode generates and amplifies RF oscillations in continuous-wave or pulsed mode with anode modulation.

The triode is available in two variants differing in the type of cooling: the GI-21 B has a heat sink and is designed for forced air cooling and the GI-210 has no heat sink and requires other systems of cooling.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Height: at most 88.5 mm with heat sink, 78.7 mm with no heat sink.
Diameter: at most 45 mm with heat sink, 36.3 mm with no heat sink.
Mass: at most 120 g with heat sink, 60 g with no heat sink.

KP - cathode and heater; P - heater; C - grid; A - anode

Vibration loads:
frequencies, Hz 5-2,000
acceleration, m/s² 98
Multiple impacts with acceleration, m/s² 735
Single impacts with acceleration, m/s² 4,900
Linear loads with acceleration, m/s² 980
Ambient temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

Electrical Parameters
Heater voltaqe, V 12.6
Heater current, A 0.83-0.93
Mutual conductance (at anode voltage, 600 V, grid voltage change ±0.5 V, anode current 75 mA), mA/V 23-34
Penetration factor (at anode voltage 600 V, anode voltage change -200 V, anode current 75 mA), % 0.65-1.4
Cutoff voltage (at anode voltage 600 V, grid current 0.5 µA), V 0 to -1.5
Interelectrode capacitance, pF:
Input 11.2-13.4
output, at most 0.05
transfer 2.7-3.4
Warm up time, s, at most 60
Output power, W, min.:
51 heater voltage 10.7 V, anode voltage 300 V, cathode current 150 mA, wavelength at most 13 cm 22
over 500 h of service 20

Limit Operating Values
Heater voltage, V 11.35-13.85
Anode voltage, V:
DC in CW operation 800
DC with cold cathode 1,000
peak value (with pulse duration at most 5 µs) 5
Cathode current, A:
DC component CW operation 0.25
peak value (with pulse duration at most 5 µs) 4.5
Dissipation, W:
with forced cooling 110
with no forced cooling 25
grid 2
Wavelength, cm:
in CW operation, at least 10
in pulsed operation, at least 9.5
Cathode heating time, s, at least 60
Anode temperature, °C 200
Temperature at leads of cathode and grid, °C 140
Resistance in grid circuit, kOm, at least 10

Averaged Anode Characteristic Curves