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GMI-90
BEAM-POWER TETRODE
The GMI-90 beam-power tetrode is used in pulse modulators in stationary RF equipment
GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, with base.
Height: at most 250 mm.
Diameter: at most 145 mm.
Mass: at most 1.3 kg
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| OPERATING ENVIRONMENTAL CONDITIONS | |
| Vibration loads: | |
| frequencies, MHz | 20-80 |
| acceleration, m/s² | 39 |
| Multiple impacts with acceleration, m/s² | 49 |
| Relative humidity at up to +40 °C, % | 98 |
|
BASIC DATA Electrical Parameters |
|
| Heater voltage, V | 25 |
| Heater current, A | 6.5-7.8 |
| Peak anode current (at anode voltage 33 kV, bias voltage -0.6 kV, grid 2 voltage 1.75 kV), A, at least | 40 |
| Cutoff voltage (at anode voltage 33 kV, grid 2 voltage 1.75 kV, anode current 0.5 mA), V, at most | 550 |
| Interelectrode capacitance, pF: | |
| input, at most | 150 |
| output, at most | 35 |
| transfer, at most | 10 |
| Electrical parameters over 350 h of service: | |
| peak anode current, A, at least | 36 |
| Limit Operating Values | |
| Heater voltage, V | 23.75-26.25 |
| Anode voltage, kV | 33 |
| Grid 2 voltage, kV | 1.75 |
| Peak grid 1 excess voltage, V | 300 |
| Peak anode current, A, at least | 36 |
| Dissipation, W: | |
| anode | 140 |
| grid 2 | 45 |
| grid 1 | 5 |
| Pulse duration, µs | 3 |
| Warm up time, s, at least | 300 |
| Envelope temperature, °C | 170 |