GMI-83

Description

Pulse modulator tetrode tube GMI-83 in glass design with an indirectly heated oxide cathode with natural or forced air cooling. Designed to amplify high-frequency oscillations in pulse modulators with an anode voltage per pulse of up to 20kV and a current per pulse of more than 15A. The GMI-83 pulse modulator tetrode is used in general-purpose radio equipment. Available in glass design with 4-pin electrode leads and a separate anode lead.
Works in a vertical position, with the terminals facing down.

Equivalent to tube EV575

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

Technical specifications:

• Filament current: 2.0 ± 0.35A
• Anode current per pulse: is at least 15A
• Anode current in a pulse (at Un=22V): no less than 12A
• Anode current at the beginning of the characteristic (at Un=27V, Uа=1.2kV, Uс2=1kV, Uс1= -500V): no more than 0.7mA
• Current of the 2nd grid in a pulse: is no more than 5A
• Current of the 2nd grid (at Uа=1.2kV, Un=27V, Uс2= 1kV, Iа=50mA): no more than 8mA
• The current of the 1st grid per pulse: is no more than 4A
• Current of the 1st grid: no more than 0.5mA
• Current of the 1st grid is reverse (at Uа=1.2kV, Un=27V, Uс2=1kV, Iа=50mA): 20 ± 20μA
• Anode load resistance: 1100Ohm

Limiting performance:

• Filament voltage: 22.5 – 27.5V
• Anode voltage: 20kV
• Anode voltage: 20kV
• 2nd grid voltage: 1.25kV
• 1st grid voltage: -1000V
• Voltage of the 1st grid in a pulse: 300V
• Anode current per pulse: 15A
• Power dissipated by anode: 65W
• Power dissipated by 2nd grid: 8W
• Power dissipated by 1st grid: 3W
• Pulse duration: 2.5 µs
• The maximum temperature of the cylinder: 200°C
• Ambient operating temperature range from: -60 to + 70°C

Operating time not less than 1500 hours.