U1820

Half-wave rectifier for electronic power-supply service, with manufacturer documentation defining its voltage, current, and intended operating conditions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B4
Base pins: -
Nominal heater: 4 V / 2.8 A

Description

The Marconi U1820 is a directly heated bi-phase half-wave rectifier for capacitor-input supplies.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 2.8 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: 2400 V
Rectifier nominal output current: 275 mA
Rectifier peak forward current: 750 mA
Rectifier max heater-cathode voltage: 0 V

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 2400 V
Rectifier nominal output current: 275 mA
Rectifier peak forward current: 750 mA
Rectifier max heater-cathode voltage: 0 V

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Heater/filament voltage
4 V
Heater/filament current
2.8 A
Peak inverse voltage
2400 V
Nominal/maximum output current
275 mA
Peak anode current
750 mA
Surge anode current
2.5 A
Typical output voltage
1060 V
CapacitorInput

Construction

Rectifier topology
Bi-phase/full-wave