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2A4G

Gas-filled grid-controlled thyratron for switching, controlled-rectifier, relay, motor-control, oscillator, or pulse service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 5S
Socket code: IO
Base pins: 5
Nominal heater: 2.5 V / 2.5 A

Description

Directly heated gas triode used for relay-control service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 5S
Socket code: IO
Base pins: 5
Nominal heater voltage: 2.5 V
Nominal heater current: 2.5 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

5S - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IS	A	IS — Internal Screen EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5S
PIN2F	—	F — Filament EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5S
PIN3P	A	P — Plate (Anode) EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5S
PIN5G1	A	G1 — Control Grid EIA chart transcription; manufacturer corroboration pending; preserve source designation G1	Unverified EIA Base Connections, printed page 127, 5S
PIN7F	—	F — Filament EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5S

Section ratings

1 physical section, each with unique specifications.

Section 1

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 200 V
Max cathode current: 100 mA

Argon-filled thyratron. Maximum instantaneous forward and inverse anode voltage 200 V; peak anode current 1.25 A.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

Tension filament 2,5 volts
2.5 V
Tension filament 2,5 volts
Courant filament 2,5 ampéres
2.5 A
Courant filament 2,5 ampéres
Tension filament ... 2,5 volts
2.5 V
Tension filament ... 2,5 volts
Chute de tension dans le tube ... 15 volts
15 V
Chute de tension dans le tube ... 15 volts

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

Anode voltage drop
15 V
RelayControl

Other

DC anode current maximum
100 mA
RelayControl
Peak inverse voltage maximum
200 V
RelayControl
Peak anode current maximum
1.25 A
RelayControl

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Peak Anode Current
1.25 A
Instantaneous

Characteristic

ColdStartingTime
2 s