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MW312

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.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: VII
Socket code: -
Base pins: -
Nominal heater: 4 V / 1.2 A

Description

White-screen cathode-ray tube for television receivers with double magnetic deflection and magnetic concentration.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: VII
Socket code: -
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 1.2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

VII - 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.

Promoted only where a fixed schema field matched the source semantics; all other published operating, capacitance, CRT, converter, and output data are preserved in TUBE_SECTION_PARAMETER.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Construction

Screen phosphor color
White
CathodeRay
Deflection
Double magnetic
CathodeRay

Other

Maximum screen diameter
310 mm
CathodeRay
Greatest overall length maximum
695 mm
CathodeRay
Greatest overall length minimum
660 mm
CathodeRay
Maximum third-anode voltage
6000 V
CathodeRay
Second-anode focusing
Magnetic concentration
CathodeRay
Maximum first-anode voltage
250 V
CathodeRay
Maximum grid bias for ray suppression
-60 V
CathodeRay
Operating third-anode voltage
5000 V
CathodeRay
Operating first-anode voltage
250 V
CathodeRay
Magnetic-concentration coil turns approximately
500 turns
CathodeRay
Concentration-coil center distance from lower edge of base
140 mm
CathodeRay
Deflection-coil center distance to screen
420 mm
CathodeRay

Characteristic

Magnetic deflection sensitivity N1
1.8 mm/(cm·G)
CathodeRay
Magnetic deflection sensitivity N2
1.8 mm/(cm·G)
CathodeRay