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Specialized - Thyratron ·Thyratron

GL1

Mercury-argon thyratron for heavy controlled-power switching. Its high heater demand supports substantial gas-discharge current.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
IO
Base pins
-
Nominal heater
25 V / 7 A

Description

The Ferranti GL1 is a directly heated mercury-argon triode thyratron for controlled high-current switching.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
-
Nominal heater voltage
25 V
Nominal heater current
7 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

Thyratron

X-ray radiationInterelectrode capacitances
Max plate voltage
1250 V
Max cathode current
1.5 A

Directly heated mercury-argon thyratron 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristics

  • Filament Voltage

    25 V

  • Filament Current

    7 A

  • Minimum Heating Time

    15 s

  • Peak Voltage Drop

    16 V

  • Minimum Grid Circuit Resistance

    1000 ohm

  • Grid-to-Anode Capacitance

    8 pF

  • Grid-to-Filament Capacitance

    5.8 pF

Other

  • Maximum Peak Forward Anode Voltage

    1250 V

  • Maximum Peak Inverse Anode Voltage

    1250 V

  • Maximum Peak Anode Current

    6 A

  • Maximum Mean Anode Current

    1.5 A

  • Maximum Instantaneous Grid Current

    50 mA

  • Maximum Power Supply Frequency

    400 Hz