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Specialized - Cathode Ray ·CathodeRay

DG71

Philips/Mullard DG-series cathode-ray instrument tube intended for oscillographic and measurement display, with manufacturer-defined electrostatic focusing, deflection, screen, and accelerating characteristics for type DG71.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12A
Base pins
-
Nominal heater
4 V / 1 A

Description

High-vacuum oscilloscope CRT with green screen.

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
4 V
Nominal heater current
1 A
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
800 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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Screen diameter

    75 mm

  • Greatest overall length

    165 mm

  • Greatest length without pins

    150 mm

  • Maximum second-anode voltage

    800 V

  • Maximum first-anode voltage

    300 V

  • Maximum grid bias for ray suppression

    -30 V

  • Second-anode voltage

    800 V

  • First-anode voltage

    200 V

Characteristic

  • Deflection sensitivity N1

    0.2 mm/V

  • Deflection sensitivity N2

    0.14 mm/V

Capacitance

  • Grid capacitance

    7 pF

  • Deflection-plate capacitance D1-D1'

    3 pF

  • Deflection-plate capacitance D2-D2'

    4 pF

Data set 02

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Focusing method

    Electrostatic

  • Deflection method

    Double electrostatic

  • Screen fluorescence

    Green

Application

  • Application

    Oscilloscope / oscillography display

Data set 03

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Second-anode voltage

    800 V

  • First-anode voltage

    150 to 350 V

  • Maximum second-anode voltage

    800 V

  • Maximum first-anode voltage

    350 V

Characteristic

  • Deflection sensitivity N1

    0.22 mm/V

  • Deflection sensitivity N2

    0.14 mm/V

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Anode voltage

    500 to 800 V

    Published datasheet value

  • Auxiliary anode voltage

    140 to 220 V

    Published datasheet value

  • Grid voltage

    -30 to 0 V

    Published datasheet value

Characteristics

  • First-pair deflection sensitivity

    0.22 to 0.35 mm/V

    Published datasheet value

  • Second-pair deflection sensitivity

    0.14 to 0.24 mm/V

    Published datasheet value

  • Grid-to-cathode capacitance

    6 pF

    Published datasheet value

  • First plate-pair capacitance

    1 pF

    Published datasheet value

  • Second plate-pair capacitance

    3 pF

    Published datasheet value

  • Maximum writing speed

    0.3 km/s

    Published datasheet value

  • Screen diameter

    7.5 cm

    Published datasheet value