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MF4115

Philips/Mullard radar cathode-ray display tube with magnetic focusing and deflection, long-persistence screen characteristics, and high-voltage operation tailored to radar presentation for type MF4115.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

Large metal-cone radar CRT with metal-backed orange 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: 12000 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

Other

Maximum Plate Voltage
12000 V
Typical Anode Voltage
12000 V
Maximum Anode Voltage
12000 V

Characteristic

Focusing Method
Magnetic
Deflection Method
Magnetic
Screen
Orange

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
12 kV
RadarCRT
Grid No.2 voltage
300 V
RadarCRT
Grid No.1 cutoff voltage minimum
30 V
RadarCRT
Grid No.1 cutoff voltage maximum
70 V
RadarCRT
Anode voltage maximum
16 kV
RadarCRT
Anode voltage minimum
8 kV
RadarCRT

Construction

Focusing
Magnetic
CathodeRay
Deflection
Double magnetic
CathodeRay
Screen color
Orange
CathodeRay
Screen persistence
Long
CathodeRay
Screen construction
Metal-backed
RadarCRT

Data set 03

1963 Philips Electron Tubes Handbook V3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Construction

Screen color
Orange
RadarCRT
Focusing
Magnetic
RadarCRT
Deflection
Magnetic
RadarCRT

Other

Useful screen diameter
360 mm
RadarCRT
Final accelerator voltage
12 kV
RadarCRT
Grid No.2 voltage
300 V
RadarCRT
Grid No.1 extinction voltage minimum
-70 V
RadarCRT
Grid No.1 extinction voltage maximum
-30 V
RadarCRT
Final accelerator voltage maximum
16 kV
RadarCRT

Capacitance

Grid capacitance maximum
8 pF
Section1
Cathode capacitance maximum
8 pF
Section1

Data set 04

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
368 mm
Deflection method
Magnetic
Focusing method
Magnetic
Screen construction
Metal-backed

Other

Operating anode voltage
12000 V
Maximum anode voltage
16000 V
Grid No.2 / auxiliary anode voltage
300 V

Capacitance

Grid capacitance maximum
8 pF