CX380

Cunningham directly heated full-wave rectifier for radio power supplies. Rated for approximately 550 V peak inverse voltage and 135 mA DC output from a 5 V filament.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: UX4
Base pins: -
Nominal heater: 5 V / 2 A

Description

CX380: Cunningham power-supply rectifier tube. The complete bulletin was read for construction, ratings, circuit recommendations, and operating characteristics.

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: -
Nominal heater voltage: 5 V
Nominal heater current: 2 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: 550 V
Rectifier nominal output current: 135 mA

Published ratings and characteristic constants promoted where applicable; operating recommendations retained as parameters.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 550 V
Rectifier nominal output current: 135 mA

Second physical rectifier section; electrical properties populated from applicable published ratings.

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

1931 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Filament/heater voltage
5 V
Filament/heater current
2 A

Other

Peak inverse/anode AC voltage
550 V
DC output current
135 mA
Plate AC voltage per plate
550 V
ChokeInputFilter
DC load current
135 mA
ChokeInputFilter
Minimum input choke
20 H
ChokeInputFilter

SECTION 2

Rectifier

Characteristics

Filament/heater voltage
5 V
Filament/heater current
2 A

Other

Peak inverse/anode AC voltage
550 V
DC output current
135 mA
Plate AC voltage per plate
550 V
ChokeInputFilter
DC load current
135 mA
ChokeInputFilter
Minimum input choke
20 H
ChokeInputFilter