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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

31MC4

Thirty-one-centimeter electromagnetic television picture tube with magnetic focusing and deflection and an ion trap. Designed for direct-view monochrome receiver service, it uses conventional magnetic beam control.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
7
Nominal heater
6.3 V / 600 mA

Description

31 cm electromagnetic television cathode-ray tube with ion trap; the sheet also compares related 31MR4, 31MG4 and 31MS4 models.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
600 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

Cathode Ray

X-ray radiationInterelectrode capacitances
Max plate voltage
11000 V

31MC4 section; related 31MR4/31MG4/31MS4 designations printed on sheet are distinct models, not treated as aliases.

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 Mazda

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • MinimumAnode2Voltage

    8.6 kV

  • MaximumAnode1Voltage

    400 V

  • TypicalAnode2Voltage

    9 kV

  • TypicalAnode1Voltage

    250 V

  • Maximum Heater Cathode Voltage

    150 V