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Specialized - Cathode Ray ·CathodeRay

DG75

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 DG75.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B8G
Base pins
-
Nominal heater
6.3 V / 310 mA

Description

The Mullard DG75 is a high-vacuum electrostatic oscilloscope tube with an approximately 2.5-inch screen and green medium persistence phosphor.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B8G
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
310 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
400 V

Electrostatic focusing/deflection CRT section; electrical/screen/deflection data retained in parameter rows.

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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • Screen Colour / Persistence

    Green, medium persistence

  • Focusing Method

    Electrostatic

  • Deflecting Method

    Double Electrostatic

Other

  • Anode Voltage

    800 V

  • Focusing Electrode Voltage Minimum

    200 V

  • Focusing Electrode Voltage Maximum

    300 V

Data set 02

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum Plate Voltage

    400 V

  • Grid 2 Operating Voltage Minimum

    200 V

  • Grid 2 Operating Voltage Maximum

    300 V

  • Maximum Grid 2 Voltage

    400 V

Characteristic

  • Focusing Method

    Electrostatic

  • Deflection Method

    Double electrostatic

  • Screen Variant

    green, medium persistence

Data set 03

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Construction

  • Focusing

    Electrostatic

    OscilloscopeCRT

  • Deflection

    Double electrostatic

    OscilloscopeCRT

  • Screen fluorescence

    Green

    OscilloscopeCRT

  • Screen persistence

    Medium

    OscilloscopeCRT

  • Screen variant

    DG7-5

    OscilloscopeCRT

Other

  • Heater voltage

    6.3 V

    OscilloscopeCRT

  • Heater current

    300 mA

    OscilloscopeCRT

  • Accelerator voltage

    800 V

    OscilloscopeCRT

  • Focusing voltage minimum

    200 V

    OscilloscopeCRT

  • Focusing voltage maximum

    300 V

    OscilloscopeCRT

  • Grid No.1 extinction voltage maximum

    50 V

    OscilloscopeCRT

  • Accelerator voltage maximum

    1000 V

    OscilloscopeCRT

Characteristic

  • Deflection sensitivity D1

    0.25 mm/V

    OscilloscopeCRT

  • Deflection sensitivity D2

    0.16 mm/V

    OscilloscopeCRT