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

MW3644

Rectangular television picture tube with ion trap, filter glass, magnetic focusing, and magnetic deflection for direct-view monochrome receiver service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12A
Base pins
-
Nominal heater
6.3 V / 300 mA

Description

Rectangular television picture tube with ion trap and filter glass, magnetic focusing, and magnetic deflection.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12A
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
300 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
14000 V

Rectangular television picture tube with filter glass, ion trap, magnetic focusing, and magnetic deflection.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • DeflectionMethod

    Magnetic

  • FocusingMethod

    Magnetic

  • UsefulScreenDiagonalMinimum

    318 mm

  • IonTrapPresent

    1 boolean

  • FilterGlassPresent

    1 boolean

Other

  • TypicalAcceleratingVoltage

    12000 V

  • MaximumAcceleratingVoltage

    14000 V

Data set 02

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

  • Grid-1 capacitance

    7 pF

  • Cathode-plus-grid-3 capacitance

    8 pF

Other

  • Screen color

    White

  • Color temperature

    7500 K

  • Light transmission

    66 %

  • Useful diagonal

    318 to - mm

    Minimum

  • Useful width

    288 to - mm

    Minimum

  • Useful height

    217 to - mm

    Minimum

  • Vertical deflection angle

    - to 52 deg

  • Horizontal deflection angle

    - to 65 deg

  • Grid-4 voltage

    12000 V

  • Grid-2 voltage

    250 V

  • Grid-3 voltage

    0 to 250 V

  • Maximum grid-4 voltage

    14000 V

  • Minimum grid-4 voltage

    9000 V

  • Maximum grid-2 voltage

    410 V

  • Minimum grid-2 voltage

    200 V

  • Maximum grid-1 bias magnitude

    150 V

Characteristic

  • Grid-1 cutoff-voltage magnitude

    33 to 72 V

  • Focusing ampere-turns

    960 to 1015 A-turns

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

  • Capacitance

    8 pF

    Capacitances Cgt = T pF Ck+gl = 8 pF

  • Capacitance

    2

    Capacités B 2\

  • Capacitance

    8 pF

    Capacitances Cg1 = 7T pF Cx+gl =_ 8 pF

Characteristic

  • Heater voltage

    9.5 V

    heater voltage must not exceed 9.5 V when the supp-

  • Heater voltage

    9.5 V

    wird, darf die Heizspannung beim Einschalten 9,5 V

  • Deflection

    2

    2) The distance from deflection centre to reference

  • Deflection

    1

    3)Space for deflection and focu51ng coils

  • Deflection

    2

    2y The distance from deflection ceuntre to reference

  • Deflection

    3

    3) space for deflection and focusing coils