U37

Marconi subminiature directly heated high-voltage half-wave rectifier for EHT supplies, providing approximately 15 kV inverse-voltage capability at low current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 140 mA

Description

The Marconi U37 is a subminiature directly heated high-voltage half-wave rectifier for eht service.

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: 1.4 V
Nominal heater current: 140 mA
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: 15000 V
Rectifier nominal output current: 2 mA
Rectifier peak forward current: 12 mA

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
1.4 V
Heater/filament current
140 mA
Peak inverse voltage
15000 V
Nominal/maximum output current
2 mA
Peak anode current
12 mA
Surge anode current
40 mA

Construction

Rectifier topology
Half-wave

Capacitance

Anode capacitance
0.65 pF