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KD21

Cold-cathode glow-discharge voltage stabilizer for heaterless shunt regulation or reference service in electronic power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

Cold-cathode glow-discharge voltage stabilizer, nominally 75 V at 5–40 mA.

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: -
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

1 physical section, each with unique specifications.

Section 1

Voltage Regulator

X-ray radiationInterelectrode capacitances

Regulator voltage: 75 V
Regulator minimum current: 5 mA
Regulator maximum current: 40 mA
Regulator starting voltage: 100 V
Regulator maintaining voltage: 75 V

Published Ferranti ratings and characteristics promoted where applicable; additional electrical, pulse, regulator, microwave, and operating data 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

Anode supply voltage minimum
105 V
Operating current minimum
5 mA
Operating current maximum
40 mA
Peak current maximum
100 mA
Pulse

Characteristics

Nominal striking voltage
100 V
Nominal operating voltage
75 V
Regulation over 5-40 mA
6 V

Application

Application
Glow-discharge voltage stabilization