GMI-29B-1
High-power pulse modulator tetrode
Description
Purpose and application
GMI-29B-1 is a high-power pulse modulator tetrode for switching high-voltage pulses in powerful modulator circuits. Its electrical and thermal class requires a dedicated heater supply, grid circuits and a forced-air cooling system.
Full descriptionCollapse description
Construction
The large metal-glass and ceramic tube has a dense external finned radiator, a glass central section and a ceramic upper insulator. Heater voltage is 12.6 V and heater current is 69.5 ± 3.5 A. The complete electrode and cooling connections must follow the equipment passport.
Operating data
The screen-grid pulse voltage is 2 kV and the control-grid pulse voltage is −1.1 kV. Input capacitance is no more than 290 pF, output capacitance no more than 55 pF, and transfer capacitance no more than 2.5 pF. Minimum specified service life is 500 hours.
Cooling and selection
Forced-air cooling is mandatory for the external radiator. The cathode requires at least 4.5 minutes to warm up; the working circuit should allow up to five minutes before applying the operating pulse mode. Inspect the fins, glass-metal seals, ceramic insulators and terminals before installation.
Vacuum device construction is outlined in the vacuum tube article. Related devices are listed under generator and modulator tubes.
Technical details
- Designation
- GMI-29B-1
- Device type
- High-power pulse modulator tetrode
- Purpose
- High-voltage pulse switching
- Construction
- Metal-glass and ceramic with external finned radiator
- Cooling
- Forced air
All specificationsCollapse specifications
- Heater voltage
- 12.6 V
- Heater current
- 69.5 ± 3.5 A
- Screen-grid pulse voltage
- 2 kV
- Control-grid pulse voltage
- −1.1 kV
- Maximum pulse screen-grid current
- 8 A
- Maximum pulse control-grid current
- 15 A
- Maximum input capacitance
- 290 pF
- Maximum output capacitance
- 55 pF
- Maximum transfer capacitance
- 2.5 pF
- Minimum cathode warm-up time
- 4.5 min
- Maximum readiness time
- 5 min
- Minimum service life
- 500 h
Payment & delivery
Orders ship from our hub in Dubai. Partner stock is first transferred to Dubai, then shipped to you.
Dubai stock: 100% before dispatch. Partner stock (Remote stock) and Pre-order: 50% advance payment to start the order and 50% before shipment from Dubai to you.
Availability, lead time, delivery cost and payment terms are confirmed for your order before payment.
Payment & delivery terms