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Tube Tinker — Electron Tube Database
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Specialized - Switching Tube ·SwitchingOther

GMI33A

Russian pulse injectron for high-power modulator switching.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
26 V / 4.4 A

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
4.4 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 0

SwitchingOther

X-ray radiationInterelectrode capacitances
Max plate voltage
70000 V

Pulse injectron; maximum pulse duration 50 microseconds; specialized SwitchingOther section.

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

2026 Russian Power

Published operating points and test conditions from this source.

SECTION 0

SwitchingOther

Other

  • Heater/filament voltage

    26 V

    Nominal heater voltage

  • Heater/filament current

    4.4 A

    Nominal heater current

  • Maximum plate voltage

    70000 V

    Maximum anode voltage

  • Maximum pulse duration

    50 µs

    Maximum pulse duration as stated in manufacturer mini-datasheet