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Specialized - Cathode Ray ·CathodeRay

MW1335

Thirteen-centimeter television viewfinder CRT with a metal-backed white screen, magnetic focusing, and magnetic deflection. Philips documentation identifies it for camera and television viewfinder monitoring.

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

Description

13 cm television viewfinder cathode-ray tube with metal-backed white screen, 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
11000 V

CRT-specific optical, focusing, deflection, accelerating-voltage, scan, capacitance, and safety data are retained in TUBE_SECTION_PARAMETER because the locked promoted fields primarily target conventional electrode sections.

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

    108 mm

Other

  • TypicalAcceleratingVoltage

    7000 V

  • MaximumAcceleratingVoltage

    11000 V

Data set 02

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Heater voltage

    6.3 V

    CathodeRay

  • Heater current

    300 mA

    CathodeRay

  • Accelerator/anode voltage

    7 kV

    TelevisionViewfinder

  • Grid No.2 voltage

    300 V

    TelevisionViewfinder

  • Grid No.1 cutoff voltage minimum

    30 V

    TelevisionViewfinder

  • Grid No.1 cutoff voltage maximum

    70 V

    TelevisionViewfinder

Construction

  • Focusing

    Magnetic

    CathodeRay

  • Deflection

    Double magnetic

    CathodeRay

  • Screen color

    White

    CathodeRay

  • Screen construction

    Metal-backed

    TelevisionViewfinder

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Grid No.1 cutoff voltage

    -30 to -70 V

Construction

  • Useful screen diameter

    110 mm

  • Deflection method

    Magnetic

  • Focusing method

    Magnetic

  • Screen construction

    Metal-backed

Other

  • Operating anode voltage

    7000 V

  • Maximum anode voltage

    11000 V

  • Grid No.2 / auxiliary anode voltage

    300 V

Capacitance

  • Grid capacitance maximum

    10 pF