442BU

Cossor full-wave power-supply rectifier for AC-to-DC conversion. Its four-volt filament reflects contemporary British equipment practice, while available documentation supports ordinary full-wave rectifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / -

Description

442BU: Cossor power-supply rectifier. The complete Cossor sheet was read for construction, technical data, operating recommendations, and application notes.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: -
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

Max plate voltage: 0 V

Published ratings and characteristic constants promoted where applicable; remaining useful data retained as parameters.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Max plate voltage: 0 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

1936 Cossor Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Heater/filament voltage
4 V

Other

Maximum anode voltage
-

SECTION 2

Rectifier

Characteristics

Heater/filament voltage
4 V

Other

Maximum anode voltage
-