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Specialized - Cathode Ray ·CathodeRay

AF3648

Rectangular radar cathode-ray tube with gray filter glass, metal-backed screen, low-voltage electrostatic focusing, and double magnetic deflection for specialized radar presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL7
Base pins
-
Nominal heater
6.3 V / 300 mA

Description

AF3648 is a CathodeRay device. Rectangular radar cathode-ray tube with gray filter glass, metal-backed screen, low-voltage electrostatic focusing, and double magnetic deflection.

Socket description

Duodecal 7-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL7
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

No fixed ratings are recorded for this section.

Rectangular radar cathode-ray tube with gray filter glass, metal-backed screen, low-voltage electrostatic focusing, and double 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

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

  • Heater current

    300 mA

  • Screen color

    Orange with orange afterglow

  • Useful diagonal

    318 to - mm

    Minimum

  • Useful width

    288 to - mm

    Minimum

  • Useful height

    217 to - mm

    Minimum

  • Grids 3 and 5 voltage

    14 kV

  • Grid 4 voltage

    -200 to 200 V

  • Grid 2 voltage

    300 V

  • Grid 1 cutoff voltage magnitude

    30 to 70 V

Capacitance

  • Grid-1 capacitance

    - to 8 pF

    Maximum

  • Cathode capacitance

    - to 8 pF

    Maximum

  • Grid-3+5 to outer-coating capacitance

    1100 pF

Characteristic

  • Resolution

    650 to - lines

    Minimum; picture height 217mm; brightness 50 ft-lamberts

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

Construction

  • Useful screen diagonal/diameter

    318 mm

  • Deflection method

    Magnetic

  • Screen construction

    Metal-backed

Capacitance

  • Grid No.1 capacitance maximum

    8 pF

  • Cathode capacitance maximum

    8 pF

Other

  • Grid No.2 voltage

    300 V