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Specialized - Cathode Ray ·CathodeRay

M4612

Philips/Mullard monochrome cathode-ray picture tube for direct-view television service, with manufacturer-defined screen dimensions, magnetic deflection, focusing, and high-voltage operation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
4 V / 1.2 A

Description

The Mullard M4612 is a 12-inch television cathode-ray tube with a white screen and double electromagnetic deflection.

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
4 V
Nominal heater current
1.2 A
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

No fixed ratings are recorded for this section.

Television CRT electron-gun/display section.

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 Mullard

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    4 V

  • Heater Current

    1.2 A

  • Screen Size

    12 in

  • Fluorescence

    White text

  • Deflection Method

    Double Electromagnetic text

  • Grid Cutoff Voltage Range

    0 to -60 V

  • Grid Input Capacitance

    60 pF

Other

  • Second Anode Voltage Minimum

    4000 V

  • Second Anode Voltage Maximum

    5000 V

  • First Anode Voltage

    250 V

  • Focusing Coil Ampere Turns

    500 AT

  • Maximum Second Anode Voltage

    6000 V

  • Maximum First Anode Voltage

    250 V