GI-6b
Triode

The GI-6b triode is designed for use in microwave oscillator circuits with no external feedback, providing continuous wave or pulsed operation with anode modulation in the decimetric wavelength range.  This tube was originally developed by the Germans during W.W.II for self-oscillating radars, and it was copied by the Russians after the war for use in radar, even as recently as the beginning of 1970's.  The original tube designation for the LD6 or GI-6B was either LD11 /GI11B or LD12/GI12B, and it is useless as an amplifier in the decimetric wavelength range because it has very high internal capacitive coupling - three wires welded to the cathode going through holes in the grid and forming a capacitor to the anode.  The tube is being used quite successfully as an amplifier at 50MHz, however, and some say it is useful even as high as 432MHz.  As with most Russian power triodes, the heat sink on the GI-6b is removable.


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GENERAL
Cathode:  indirectly heated, dispenser, oxide-coated.
Envelope:  metal-ceramic.
Cooling:  24 m3/hr forced air.
Height, mm, at most: with heat sink: 110.5
without heat sink: 97
Diameter, mm, at most: with heat sink: 65
without heat sink: 36.3+
Mass, gm, at most: with heat sink: 330
without heat sink: 170

gi-6 b

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequency, Hz 5-600
acceleration, m/s² 59
Multiple loads with acceleration, m/s² 342
Single impacts with acceleration, m/s² 1,465
Linear loads with acceleration, m/s² 490
Ambient Conditions:
Temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 95-98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 12.6
Heater current, A 1.925
Mutual conductance (Va = 1.2 kV, Ia = 150 mA, change in Vg = 1V), mA/V, at least 22
Operating point (negative Vg with Va = 1.3KV, Ia = 150mA), V 9
input capacitance, pF: 11.1
output capacitance, pF: 4.6
transfer capacitance, pF: 0.25
Warm up time (Va = 400 V), at most 90
Output power in CW operation (Va = 1.05 kV, Ia = 300 mA, wavelength 18.5 cm), W >30
Output power in pulsed operation (at peak Va = 9 kV, Ia = 7.5 A, wavelength 10 cm, 1/pulse duty factor 1,400-150, pulse duration 3-10 s), KW >11
Designed Tube Life (hours) >650

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 12-13.2
Heater current, A 1.8-2.05
Mutual conductance (Va = 1.2 kV, Ia = 150 mA, change in Vg = 1V), mA/V, at least 18-26
Operating point (negative Vg with Va = 1.3KV, Ia = 150mA), V 6-12
input capacitance, pF 10-12.7
output capacitance, pF: 4-5.2
transfer capacitance, pF 0.2-0.3
Maximum CW Anode voltage (Va), KV: 2.5
Maximum Instantaneous value Anode voltage (Va), KV: 5
Instantaneous value Grid voltage (Vg), V -300 to +80
Maximum CW Cathode current (Ic), r.m.s./key down, A 0.6 / 0.4
Anode Dissipation, W: 350
Grid Dissipation, W: 7
Temperature at anode lead, °C 200
Temperature at radiator, °C 160
Temperature at cathode leads, °C 100
Temperature at grid leads, °C 200
Temperature at external ceramic parts, °C 250
Minimum wavelength in CW operation, cm 22
Minimum wavelength in pulsed operation, cm 18

gi-6 b
Averaged Pulse-Operation Characteristic Curves:
Uf = 12.6V; Ug2 = -200 V; Timp = 1 s; frequency 1,000 imp/s;
_____ anode;
- - - grid-anode
gi-6 b
Averaged Pulse-Operation Characteristic Curves:
Uf = 12.6V; Ug2 = -200 V; Timp = 1 s; frequency 1,000 imp/s;
_____ anode;
- - - grid-anode


gi-6b
Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in Continuous-Wave Generation:
Uf = 12.6V; L = 25cm;
- - - (Pa max)


gi-6b
Averaged Anode Characteristic Curves


gi-6b
Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in Continuous-Wave Generation:
Uf = 12.6V; L = 50cm;
- - - - (Pa max)
gi-6b
Averaged Anode-Grid Characteristic Curves