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DH1078

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 DH1078.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

Flat-face post-deflection-acceleration 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: 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

No fixed ratings are recorded for this section.

CRT-specific optical, focusing, deflection, accelerating-voltage, scan, and capacitance data are retained in TUBE_SECTION_PARAMETER because the locked promoted fields primarily target conventional electrode sections.

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

Useful screen diameter
90 mm
Useful screen diameter 90 mm
Heater voltage Vf
-6.3 V
Heater voltage Vf-6.3V
Heater current If
300 mA
Heater current If = 0.3 A
Grid No
5 pF
Grid No.1 to all other electrodes Cg1 = 5.0 pF
Cathode to all other electrodes Ck
3.4 pF
Cathode to all other electrodes Ck = 3.4 pF
LINE WIDTH measured on a circle of
50 mm
LINE WIDTH measured on a circle of 50 mm diameter
Beam current
0.5 uA
Beam current 0.5µA 0.5µA 0.5µA
Line width l.w
0.45 mm
Line width l.w. = 0.45 mm 0.35 mm 0.45 mm V
Line width l.w
0.35 mm
Line width l.w. = 0.45 mm 0.35 mm 0.45 mm V
Accelerator voltage Vg
1000 V
Accelerator voltage Vg2.g4 = min. 1000 V
Focusing voltage V
150 to 350 V
Focusing voltage V83 = 150-350 V
focused spot -Vgt
22.5 to 37.5 V
focused spot -Vgt = 22.5-37.5 V
Useful screen diameter
90 mm
Useful screen diameter
Post-deflection acceleration present
1
Source explicitly describes post-deflection acceleration

Other

Focusing voltage Vg
1500 V
Focusing voltage Vg3 = max. 1500 V