412A

Miniature full-wave rectifier containing two identical rectifier sections. Rated for approximately 1.25 kV peak inverse voltage, 100 mA DC output, and 300 mA peak forward current from a 6.3 V heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: UX4
Base pins: 9
Nominal heater: 6.3 V / 1 A

Description

Miniature full-wave rectifier with two identical rectifier sections.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UX4
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 1 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

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1250 V
Rectifier nominal output current: 100 mA
Rectifier peak forward current: 300 mA
Rectifier max heater-cathode voltage: 450 V

Promoted fields mapped from printed maximum-rating and characteristic headings; additional published values preserved in parameter rows. Representative row for repeated identical physical sections.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1250 V
Rectifier nominal output current: 100 mA
Rectifier peak forward current: 300 mA
Rectifier max heater-cathode voltage: 450 V

Second physical rectifier section; electrical properties populated from corresponding identical section.

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

2026 Western Electric 400s

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Peak Plate Current per Plate
300 amperes
Peak Plate Current per Plate 300 mill!amperes
Heater Voltage
6.3 volts
Heater Voltage 6.3 volts
D-C Output Current
90 amperes
D-C Output Current 90 mi I Ii amperes

SECTION 2

Rectifier

Characteristic

Peak Plate Current per Plate
300 amperes
Peak Plate Current per Plate 300 mill!amperes
Heater Voltage
6.3 volts
Heater Voltage 6.3 volts
D-C Output Current
90 amperes
D-C Output Current 90 mi I Ii amperes