MICROWAVE TRIODE
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The GS-9b microwave triode is used for RF voltage generation in external-feedback oscillators designed for continuous operation in the decimetric wavelength range down to 9cm. The triode is available in two variants: with heat sink, for forced air cooling (GS-9b), and without heat sink, for other types of cooling (GS-90b). The GS-9b is physically identical to the GI-6b and GI-7b, but several electrical parameters are different. |
| GENERAL | |
| Cathode: indirectly heated, dispenser, oxide-coated. | |
| Envelope: metal-ceramic. | |
| Cooling: 18 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 | |
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| OPERATING ENVIRONMENTAL CONDITIONS | |
| Vibration loads: | |
| frequency, Hz | 5-600 |
| acceleration, m/s² | 59 |
| Multiple Impacts with acceleration, m/s² | 343 |
| Single impacts with acceleration, m/s² | 1,470 |
| 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 | 1.1 |
| Mutual conductance (Va = 1.3KV and Ia = 120 mA), mA/V | 19.5 |
| Penetration factor (Va = 1.3 kV, delta Va = +200 V, Ia = 120 mA), % | 0.6-1.2 |
| input capacitance, pF: | 8.4 |
| output capacitance, pF: | 3.15 |
| transfer capacitance, pF: | <0.04 |
| Warm up time, s, at most | 90 |
| Output power (CW operation at Va = 1.5KV, Ia = 175 mA, wavelength 18cm), W, at least | 40 |
| Designed Tube Life (hours) | >200 |
| ELECTRICAL PARAMETER LIMITS | |
| Heater voltage, V | 11.7-13 |
| Heater current, A | 1-1.2 |
| Mutual conductance (Va = 1.3KV and Ia = 120 mA), mA/V | 15-24 |
| input capacitance, pF: | 7.2-9.6 |
| output capacitance, pF: | 2.8-3.5 |
| Va in CW operation, KV: | 2.5 |
| Va (cold cathode), KV: | 3 |
| instantaneous value of Va in CW operation, KV: | 5 |
| Vg (instantaneous value), V: | -200 to +50 |
| Ic r.m.s.value, mA: | 330 |
| Ic DC component at frequency doubling, mA: | 190 |
| Ic instantaneous value under class  conditions, mA: | 700 |
| Anode Dissipation, W: | 300 |
| Grid Dissipation, neglecting the grid thermal current, W: | 5 |
| Grid Dissipation with grid thermal current at most 5 mA, W: | 2.2 |
| anode heat sink temperature, °C: | 130 |
| grid lead temperature, °C: | 200 |
| cathode lead temperature, °C: | 100 |
| external ceramic parts temperature, °C: | 250 |
| Minimum wavelength in CW operation, cm | 15 |
Averaged Anode-Grid Characteristic Curves
Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V
Averaged Characteristic Curves:
_____ anode;
— — — Pa max