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VX21

Subminiature directly heated high-voltage half-wave rectifier for portable and measuring instruments. Its economical filament provides approximately 3 kV peak inverse voltage at extremely low current, minimizing battery drain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.25 V / 10 mA

Description

Subminiature high-voltage half-wave rectifier designed for portable and measuring instruments requiring high voltage at low current. The same source also identifies this device as VX21.

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: 1.25 V
Nominal heater current: 10 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: 3000 V
Rectifier nominal output current: 0.2 mA
Rectifier peak forward current: 0.6 mA
Rectifier forward voltage drop: 5 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

1950 Victoreen

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Filament Voltage
1.1 to 1.5 V
TubeVoltageDropAt200uA
5 V

Other

Peak Inverse Voltage
3000 V
Peak Plate Current
600 uA
DC Output Current
200 uA

Capacitance

Capacitance
1 pF