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

MW411

Direct-view monochrome television picture tube with magnetic beam scanning and high-voltage operation. Manufacturer documentation identifies it for television receiver service and provides the applicable screen, focusing, and deflection construction.

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

Description

Television picture tube with metal cone, ion trap, 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
12000 V

Round television picture tube with 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

  • UsefulScreenDiameterMinimum

    365 mm

  • IonTrapPresent

    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

    6 pF

  • Cathode capacitance

    4 pF

Other

  • Screen color

    White

  • Color temperature

    7500 K

  • Useful diameter

    365 to - mm

    Minimum

  • Deflection angle

    - to 70 deg

  • Grid-3 voltage

    12000 V

  • Grid-2 voltage

    250 V

  • Minimum grid-3 voltage

    7000 V

  • Maximum grid-2 voltage

    410 V

  • Maximum grid-1 bias magnitude

    150 V

Characteristic

  • Grid-1 cutoff-voltage magnitude

    33 to 72 V

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

  • Capacitance

    6 pF

    Capacités Ce 6 pF

  • Capacitance

    6 pF

    Capacitances Cgt = 6 pF

  • Capacitance

    4

    Capacités Cr = 4 oF

Characteristic

  • Heater voltage

    9.5 V

    the heater voltage must not exceed 9,5 V when the

  • Heater voltage

    9.5

    wird, darf die Heizspannung beim Einschalten 9,5

  • Heater voltage

    9.5 V

    heater voltage must not exceed 9.5 V when the supply

  • Heater voltage

    9.5 V

    darf die Heizspannung beim Einschalten 9,5 V nichs

  • Deflection

    3

    3) Space for deflection and focusing coils.

  • Deflection

    0.3

    Deflection 0.3 x P x Hxcel

  • Deflection

    0

    Ablenkun, =0 x P xHxcL

  • Focusing

    290

    for focusing is about 290 VvazikVS

Other

  • Deflection

    70

    The deflection angle is max. 70°

  • Deflection

    70

    Der Ablenkungswinkel ist max. 70°.