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Rectifier - Half Wave ·Rectifier

267B

Air-cooled directly heated half-wave mercury-vapor rectifier for high-voltage supplies. Rated for approximately 7.5 kV peak inverse voltage, 2 A DC output, and 8 A peak current.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM4BAYONET
Base pins
-
Nominal heater
5 V / 6.75 A

Description

Air-cooled half-wave mercury-vapor rectifier with an oxide-coated filament, rated for 7500 V peak inverse anode voltage.

Socket description

Medium 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM4BAYONET
Base pins
-
Nominal heater voltage
5 V
Nominal heater current
6.75 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
7500 V
Rectifier nominal output current
1 A
Rectifier peak forward current
4 A
Rectifier forward voltage drop
10 V
Rectifier warm-up time
30 s

In-phase current ratings promoted; quadrature ratings retained separately as parameters when published.

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

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Filament Voltage

    5 V

  • Filament Current

    6.75 A

  • Peak Inverse Anode Voltage

    7500 V

  • Maximum Peak Anode Current

    4 A

    InPhase

  • Maximum Average Anode Current

    1 A

    InPhase

  • Maximum Averaging Time

    15 s

  • Maximum Peak Anode Current

    8 A

    Quadrature

  • Maximum Average Anode Current

    2 A

    Quadrature

Characteristic

  • Condensed Mercury Temperature Range

    35-75 °C

Data set 02

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • MaximumAverageAnodeCurrent

    1 A

    InPhase

  • MaximumAverageAnodeCurrent

    2 A

    Quadrature

  • MaximumInstantaneousAnodeCurrent

    4 A

    InPhase

  • MaximumInstantaneousAnodeCurrent

    8 A

    Quadrature