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FG172

Double-grid mercury-vapor industrial thyratron for substantial controlled-power service. Grid triggering initiates low-drop mercury-discharge conduction.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 10 A

Description

The FG-172 is a double-grid mercury-vapor thyratron for high-impedance, low-grid-power control applications; its all-metal construction provides a sturdy tube for industrial service.

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: 5 V
Nominal heater current: 10 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

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 2000 V
Max cathode current: 2.5 A

Thyratron. Forward peak anode maximum and continuous-service average anode current promoted; inverse/grid/surge ratings preserved as parameters.

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 General Electric Co

Published operating points and test conditions from this source.

SECTION 0

Thyratron

Other

Peak Inverse Anode Voltage
2000 V
ContinuousService
Instantaneous Anode Current
40 A
25CyclesAndAbove ContinuousService
Surge Anode Current
400 A
DesignOnly

Characteristic

Peak Voltage Drop
16 V
Typical
Ionization Time
10 us
Approximate
Deionization Time
1000 us
Approximate