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GMI5

Russian high-power tetrode designed for pulse-modulator or pulse-power switching service in RF equipment, controlling high-voltage, high-current pulses rather than continuous linear amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 26 V / 1.75 A

Description

The GMI5 is a pulse-modulator tetrode used as a high-voltage pulse power switch.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 26 V
Nominal heater current: 1.75 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Max plate voltage: 20000 V
Max screen voltage: 1250 V
Max plate dissipation: 50 W
Max screen dissipation: 6 W
Max grid dissipation: 3 W
Max cathode current: 27 A

Maximum pulse/modulator values promoted from English limit-operating table.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1968 Electronintorg

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heater current
1.6 A to 1.9 A
Peak anode current minimum
16 A
AnodeVoltage=20kV;Grid2=1.25kV;PulseDuration=2us;PulseRate=500/s
Average grid 2 current
0.5 to 5 mA
PulseRate=500/s
Average grid 1 current
0.5 to 3 mA
PulseRate=500/s
Negative grid 1 cutoff voltage maximum
800 V

Capacitance

Input capacitance
40 to 75 pF
Output capacitance
4 to 13 pF

Other

Maximum pulse duration
5 us