Specialized - Cathode Ray ·CathodeRay
Philips/Mullard direct-view monochrome television picture tube with magnetic deflection and family-specific focusing and heater arrangements. Manufacturer documentation identifies receiver display service across the MW22 and MW31 picture-tube families.
Direct-view television picture tube with magnetic deflection.
Duodecar 12-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Clear-face-plate television picture tube explicitly stated to be equivalent to MW31-74 but without ion trap.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
300 mA
DeflectionMethod
Magnetic
Heater Voltage
6.3 V
Heater Current
300 mA
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
300 mA
DeflectionMethod
Magnetic
FocusingMethod
Magnetic
TypicalAcceleratingVoltage
7000 V
MaximumAcceleratingVoltage
11000 V
Data set 03
Published operating points and test conditions from this source.
Equivalent electrical type
MW31-74
Source-stated equivalence
Face plate
Clear
Data set 04
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
300 mA
Grid No.1 cutoff voltage
-20 to -50 V
Useful screen diameter
265 mm
Deflection method
Magnetic
Focusing method
Magnetic
Screen construction
Metal-backed
Operating anode voltage
7000 V
Maximum anode voltage
9000 V
Grid No.2 / auxiliary anode voltage
200 V
Electrical data reference
MW3117
SourceCrossReference