FG238B

Water-cooled ignitron for industrial power rectifiers and welding control. Its controlled mercury discharge handles very high current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

The FG-238-B is a steel-jacketed water-cooled ignitron for 125-, 250-, 600-, and 900-volt DC power rectifiers and resistance-welder-control service, with very high current capability.

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: -
Nominal heater current: -
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

IgnitronPowerSwitch

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 2100 V
Rectifier nominal output current: 150 mA
Rectifier peak forward current: 1200 A

Ignitron. Higher-voltage 2100-V rectifier-service column promoted; alternate 900-V / higher-current column 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 1

IgnitronPowerSwitch

Other

Alternate Rectifier Peak Anode Voltage
900 V
RectifierService HighCurrentColumn
Alternate Continuous Average Anode Current
200 A
RectifierService 900VColumn
Alternate Instantaneous Anode Current
1800 A
RectifierService 900VColumn
Surge Current
9000 A
RectifierService 2100VColumn 0.15Second
Minimum Water Flow
3 gal/min
ContinuousAverageCurrent