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266C

Air-cooled directly heated half-wave mercury-vapor rectifier for high-power supplies. Rated for approximately 22 kV peak inverse voltage, 5 A DC output, and 40 A peak current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: MEDIUM4BAYONET
Base pins: -
Nominal heater: 5 V / 42 A

Description

Air-cooled half-wave mercury-vapor rectifier with an oxide-coated filament, rated for 22000 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: 42 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: 5 A
Rectifier peak forward current: 20 A
Rectifier forward voltage drop: 15 V
Rectifier warm-up time: 300 s

22 kV PIV is temperature-qualified; peak current uses quadrature maximum instantaneous anode current.

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
42 A
Peak Inverse Anode Voltage
22000 V
Maximum Peak Anode Current
20 A
InPhase
Maximum Average Anode Current
5 A
InPhase
Maximum Averaging Time
60 s
Maximum Peak Anode Current
40 A
Quadrature
Maximum Average Anode Current
10 A
Quadrature

Characteristic

Condensed Mercury Temperature Range
25-40 °C

Data set 02

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

MaximumAverageAnodeCurrent
5 A
InPhase
MaximumAverageAnodeCurrent
10 A
Quadrature
MaximumInstantaneousAnodeCurrent
20 A
InPhase
MaximumInstantaneousAnodeCurrent
40 A
Quadrature