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GL857B

Mercury-vapor half-wave rectifier for high-voltage industrial power conversion, using low arc voltage to provide efficient current handling in substantial DC supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4B
Base pins: -
Nominal heater: 5 V / 30 A

Description

Half-wave mercury-vapor rectifier tube for high-voltage service.

Socket description

Medium 4-pin bayonet

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4B
Base pins: -
Nominal heater voltage: 5 V
Nominal heater current: 30 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 22000 V
Rectifier nominal output current: 10 A
Rectifier peak forward current: 40 A
Rectifier forward voltage drop: 12 V
Rectifier warm-up time: 60 s

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

Rectifier

Characteristic

Heating Time
1 min
Typical
PeakVoltageDrop
12 V
Typical

Other

MaximumInstantaneousAnodeCurrent
40 A
QuadratureOperation
Maximum Surge Anode Current
400 A
DesignOnly