Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

DG731

Philips/Mullard DG-series cathode-ray instrument tube for oscillographic and measurement display, with manufacturer-defined electrostatic beam focusing, deflection, screen, and accelerating characteristics for type DG731.

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

Description

The Philips DG731 is a low-voltage oscilloscope crt with green, medium persistence.

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
500 V

Low-voltage CRT for oscilloscopes; this supplied sheet gives only low-voltage operating sensitivities and refers to DG7-31/01 and DG7-32/01 for the remaining data.

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

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • Phosphor Variant

    green, medium persistence text

    Screen fluorescence and persistence

  • Deflection System

    Electrostatic text

    Low-voltage oscilloscope CRT

Data set 02

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Accelerating-grid voltage

    500 V

Characteristic

  • Deflection sensitivity N1

    0.35 to 0.43 mm/V

    Y-axis

  • Deflection sensitivity N2

    0.24 to 0.3 mm/V

    X-axis

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Screen fluorescence

    Green

    Published datasheet value

  • Persistence

    Medium

    Published datasheet value

  • Deflection sensitivity first pair

    0.43-0.53 mm/V

    Published datasheet value

  • Deflection sensitivity second pair

    0.24-0.30 mm/V

    Published datasheet value

  • Grid No.1 capacitance

    7.6 pF

    Published datasheet value

  • Cathode capacitance

    3.2 pF

    Published datasheet value

Other

  • Grid No.2 and No.4 voltage

    500 V

    Published datasheet value

  • Grid No.3 voltage

    0 to 120 V

    Published datasheet value

  • Negative grid No.1 cut-off voltage

    50 to 100 V

    Published datasheet value

  • Maximum grid No.2 and No.4 voltage

    - to 800 V

    Published datasheet value

  • Minimum grid No.2 and No.4 voltage

    400 to - V

    Published datasheet value

  • Maximum grid No.3 voltage

    - to 200 V

    Published datasheet value

  • Maximum negative grid No.1 voltage

    - to 160 V

    Published datasheet value

  • Maximum cathode-heater voltage

    - to 125 V

    Published datasheet value

  • Grid No.2 and No.4 dissipation maximum

    - to 0.5 W

    Published datasheet value

  • Deflection plate circuit resistance maximum

    - to 5 MΩ

    Published datasheet value

  • Grid No.1 circuit resistance maximum

    - to 0.5 MΩ

    Published datasheet value