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XD18

Directly heated high-vacuum power diode for high-voltage rectifier, charging, clipper, and related service. Rated for approximately 40 kV peak inverse voltage, 15 A DC output, and 50 A peak current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10 V / 120 A

Description

XD18 is a high-vacuum diode for high-voltage rectifier, charging, clipper, and/or modulator service as specified in the datasheet.

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: 10 V
Nominal heater current: 120 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

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Max plate dissipation: 13000 W
Rectifier peak inverse voltage: 40000 V
Rectifier nominal output current: 15 A
Rectifier peak forward current: 50 A

Published ratings and characteristics promoted where directly established; additional values retained as parameters.

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

1960 Central Electronic Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak inverse voltage
40000 V
Peak anode current
50 A
Average anode current
15 A
Anode dissipation
13000 W
Clipper filament voltage
11 V
Clipper filament current
125 A
Clipper peak anode current
300 A

Characteristic

Filament voltage
10 V
Filament current
120 A

Construction

Cooling method
Forced air