GMI-90

Pulsed modulator beam tetrode GMI-90 in glass design with indirectly heated oxide cathode and forced air cooling. Designed for switching pulsed power in pulse modulators with anode voltage per pulse not exceeding 33kV and current per pulse up to 40A. Pulsed modulator tetrode GMI-90 is used in stationary general-purpose radio engineering equipment.
Available in glass design with 6-pin electrode leads and a separate anode lead.
Works in a vertical position, pins down.
Forced air cooling.

• Stamp of technical control department of the manufacturer ” ОТК “

Technical specifications:

• Heater voltage: 25V
• Heater current: 6.S – 7.8A
• Peak anode current (at anode voltage 33kV, bias
  voltage -0.6kV, grid 2 voltage 1.75kV): at least 40A
• Cutoff voltage (at anode voltage 33kV, grid 2
  voltage 1.75kV, anode current 0.5mA): at most 550V
• Interelectrode capacitance:
  input: at most 150pF
  output: at most 35pF
  transfer: at most 10pF
• Electrical parameters over 350 hours of service:
  peak anode current: at least 36A

Limiting performance:

• Heater voltage: 23.75 – 26.25V
• Anode voltage: 33kV
• Grid 2 voltage: 1.75kV
• Peak grid 1 excess voltage: 300V
• Peak anode current: at least  36A
• Dissipation:
  anode : 140W
  grid 2 : 45W
  grid 1 : 5W
• Pulse duration: 3 µ sec.
• Warm up time: at least 300 sec.
• Envelope temperature: 170 °C

Operating time not less than 350 hours.