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The GI-12B triode is used as a RF oscillator and an amplifier in continuous-wave or pulsed mode with anode modulation.

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


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 400 V, anode voltage change 400 V, anode current 15mA), % 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:
output 0.04
transfer 2-3.3
Output power in CW operation (at anode voltage 800 V, peak anode current 100 A, wavelength at most 9.3 cm), W, at least 3
Output power over 500 h of service, W 2.4

Limit Operating Values
Heater voltage, V 12-13.2
Anode voltage, kV:
DC 0.8
with cold cathode 1
peak value (with pulse duration about 5 µs) 2
Peak grid voltage (with pulse duration 5µ), 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, at least 9
Temperature, °C:
anode heat sink 200
cathode lead 100
grid lead 120
Resistance in grid circuit, kH 10

Averaged Pulse-Operation Characteristic Curves:
Uf = 12.6V; Timp = 4µs; frequency 350 imp/s;
_____ anode;
_ _ _ grid-anode

Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in Pulse Operation:
Uf = 12.6V; L = 9cm; duty factor 0.005;
grid and cathode snorted out

Averaged Characteristic Curves of Oscillator Output Power versus Anode current in Pulse Operation:
Uf = 12.6 V; L = 9cm; duty factor 5 0.005

Averaged Anode-Grid Characteristic Curves