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CL42

Low-noise helium linear light source for sound-on-film recording, interferometry, and related optical applications.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: InternationalOctal
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 1.2 A

Description

Helium-filled low-noise linear light source with output proportional to anode current, intended for sound-on-film recording, interferometry and related applications.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: InternationalOctal
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 1.2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

InternationalOctal - 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

LightSource

X-ray radiationInterelectrode capacitances

Max cathode current: 40 mA
Rectifier warm-up time: 60 s

Promoted fields were populated only where the Ferranti sheet maps cleanly to the locked schema; additional ratings and operating values are retained in TUBE_SECTION_PARAMETER.

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

LightSource

Other

Trigger voltage maximum
500 V
Mean anode current maximum
40 mA
Peak anode current maximum
90 mA
Trigger resistor recommended
22000 Ohm

Characteristics

Cathode current minimum
10 mA
MaintainDischarge
Anode-to-cathode voltage drop maximum
110 V