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Specialized - Cathode Ray ·CathodeRay-CathodeRay

DHM911

Philips DHM-series cathode-ray instrument tube for precision measurement display, with manufacturer-defined electron-optical, screen, focusing, and deflection characteristics for type DHM911.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
2
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.25 A

Description

Flat-face double-gun cathode-ray oscilloscope tube. The source provides CRT heater, focusing/deflection, capacitance, scan/sensitivity and operating data where published.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
1.25 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

2 physical sections, each with unique specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Promoted fields mapped semantically from printed ratings/characteristics headings. Fixed promoted fields are largely inapplicable to this special-purpose device; additional published data is retained in TUBE_SECTION_PARAMETER where text recovery permits.

Section 2

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second independent electron gun; electrically similar double-gun CRT section.

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

Characteristic

  • Heater voltage Vf

    6.3 V

    Heater voltage Vf = 6.3 V

  • Heater current If

    1.25 A

    Heater current If = 1.25 A

  • LINE WIDTH. measured on a circle of

    50 mm

    LINE WIDTH. measured on a circle of 50 mm diameter with

  • Accelerator voltage Vg

    1.5 kV

    Accelerator voltage Vg2.g4 = 1.5 kV

  • Beam current Il

    1 uA

    Beam current Il = 1.0 µA

  • Focusing voltage Vg

    330 to 470 V

    Focusing voltage Vg3 = 330 to 470 V

  • Negative grid No

    1 V

    Negative grid No.1 voltage

  • Accelerator voltage VB

    1 kV

    Accelerator voltage VB2 r B4 = min. 1.0 kV

  • Negative grid No

    1 V

    Negative grid No.1 voltage -VB1 1 V

  • Published CRT electrical value

    -1 V

    1 ) With V61 = -1.0 V and V83 set for focus

  • Independent beam/trace systems

    2

    Dual-trace/double-gun source description

Other

  • Line width l.w. = max

    0.8 mm

    Line width l.w. = max. 0.8 mm

  • Focusing voltage VB

    600 V

    Focusing voltage VB3 = max. 600 V

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • X deflection factor minimum

    13.8 V/cm

    per kV Vg2,g4

  • X deflection factor maximum

    18.2 V/cm

    per kV Vg2,g4

  • Y deflection factor minimum

    9.1 V/cm

    per kV Vg2,g4

  • Y deflection factor maximum

    12.2 V/cm

    per kV Vg2,g4