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Specialized - Cathode Ray ·CathodeRay

DH391

Philips DH-series cathode-ray instrument tube designed for oscillographic and measurement display, with manufacturer-defined high-performance focusing, deflection, screen, and accelerating characteristics for type DH391.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B8G
Base pins
-
Nominal heater
6.3 V / 550 mA

Description

High-vacuum miniature green-to-blue oscilloscope CRT with electrostatic self-focusing and double electrostatic deflection.

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
550 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.

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

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 to blue

    OscilloscopeCRT

  • Screen persistence

    Short

    OscilloscopeCRT

Other

  • Heater voltage

    6.3 V

    OscilloscopeCRT

  • Heater current

    550 mA

    OscilloscopeCRT

  • Useful screen diameter

    28 mm

    OscilloscopeCRT

  • Accelerator voltage

    500 V

    OscilloscopeCRT

  • Grid No.1 extinction voltage minimum

    8 V

    OscilloscopeCRT

  • Grid No.1 extinction voltage maximum

    27 V

    OscilloscopeCRT

Characteristic

  • D1 sensitivity

    0.22 mm/V

    OscilloscopeCRT

  • D2 sensitivity

    0.19 mm/V

    OscilloscopeCRT

  • D1 deflection factor

    9.1 V/mm

    OscilloscopeCRT

  • D2 deflection factor

    10.5 V/mm

    OscilloscopeCRT