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G42

Subminiature cold-cathode switching diode for DC switching and relaxation oscillators, using an oxide-coated cathode and slight preionization for reproducible firing.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Cold-cathode switching diode for DC operation with oxide-coated cylindrical cathode, slight preionization and subminiature flying-lead construction.

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

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 100 mA

Cold-cathode switching/relay/display section; device-specific glow-discharge values preserved in parameter table.

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

1962 Cerberus

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

BreakdownVoltageAK
145 to 165 V
BreakdownVoltageKA
100 V
MaintainingVoltage
50 to 65 V
At 10 mA

Other

RelaxationOscillatorPeakCurrent
- to 100 mA
C=4 uF
TypicalSupplyVoltage
250 to - V
Relaxation oscillator