| 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.
|
| 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 | |
 |
| 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 |
Averaged Pulse-Operation Characteristic Curves: Uf = 12.6V; Ug2 = -200 V; Timp = 1 ÷s; frequency 1,000 imp/s; _____ anode; - - - grid-anode |
Averaged Pulse-Operation Characteristic Curves: Uf = 12.6V; Ug2 = -200 V; Timp = 1 ÷s; frequency 1,000 imp/s; _____ anode; - - - grid-anode |
 |
|
Averaged Characteristic Curves Showing
Oscillator Output Power versus Anode Voltage in Continuous-Wave Generation: Uf = 12.6V; L = 25cm; - - - (Pa max) |
 |
| Averaged Anode Characteristic Curves |
Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in Continuous-Wave Generation: Uf = 12.6V; L = 50cm; - - - - (Pa max) |
Averaged Anode-Grid Characteristic Curves |