GMI-11
Pulse modulator tetrode
Description
Purpose and application
GMI-11 is a pulse modulator tetrode for switching high-voltage pulses in radio-transmitter modulator stages. It is intended for circuits where a powerful, short control pulse must be formed with repeatable electrical parameters.
Full descriptionCollapse description
Construction
The tube has a glass envelope, an indirectly heated cathode and a multi-electrode assembly. Heater voltage is 23.4–28.6 V and heater current is 1.75 ± 0.15 A. Correct socket wiring is essential because the device works with high pulse voltages.
Operating data
The pulse anode current is at least 14 A and remains at least 12 A at a heater voltage of 23.5 V. Input capacitance is 55 pF, output capacitance 7.5 pF, and transfer capacitance no more than 1 pF. Minimum service life is 300 hours.
Cooling and selection
The permitted ambient range is −60 to +85 °C, while the envelope temperature must remain below 250 °C. Before replacement, compare the complete GMI-11 marking, heater supply, grid bias and pulse conditions with the equipment documentation.
Vacuum device construction is outlined in the vacuum tube article. Related devices are listed under generator and modulator tubes.
Technical details
- Designation
- GMI-11
- Device type
- Pulse modulator tetrode
- Purpose
- High-voltage pulse switching
- Envelope
- Glass
- Cathode
- Indirectly heated
All specificationsCollapse specifications
- Heater voltage
- 23.4–28.6 V
- Heater current
- 1.75 ± 0.15 A
- Minimum pulse anode current
- 14 A
- Pulse anode current at 23.5 V heater voltage
- 12 A
- Maximum pulse screen-grid current
- 2.5 A
- Maximum pulse control-grid current
- 2 A
- Input capacitance
- 55 pF
- Output capacitance
- 7.5 pF
- Maximum transfer capacitance
- 1 pF
- Maximum envelope temperature
- 250 °C
- Ambient temperature
- −60 to +85 °C
- Minimum service life
- 300 h
Payment & delivery
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Payment & delivery terms