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2V531E

Mercury-vapor half-wave rectifier replacing 4078A, with quadrature filament ratings and approximately 20 kV inverse-voltage capability for high-current industrial power conversion.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SPECIAL2
Base pins: 2
Nominal heater: 5 V / 20 A

Description

Half-wave mercury-vapour rectifier; replacement for 4078A; ratings include quadrature filament excitation.

Socket description

Special 2-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SPECIAL2
Base pins: 2
Nominal heater voltage: 5 V
Nominal heater current: 20 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: 20000 V
Rectifier nominal output current: 5 A
Rectifier peak forward current: 20 A
Rectifier forward voltage drop: 12 V

Extracted semantically from complete approved datasheet.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Supply frequency
50 Hz
ChokeInputFilter
Minimum cathode heating time
1 min
Ambient>20C
Maximum fault anode current
50 A
Maximum fault-current duration
0.1 s