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DP778

Philips oscilloscope CRT for oscillography with electrostatic beam control. Manufacturer documentation covers screen, focusing and deflection, capacitance, sensitivity, and operating characteristics; several variants use flat faces and post-deflection acceleration.

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.

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

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating
Useful screen diameter
68 mm
DisplayGeometry
Line width
0.65 mm
LineWidthTest

Capacitance

Grid No.1 capacitance
3.5 pF
OscilloscopeCRT
Cathode capacitance
2.6 pF
OscilloscopeCRT
X1 plate capacitance
3.5 pF
OscilloscopeCRT

Other

Post-accelerator voltage
1200 V
LineWidthTest
Grid No.4 voltage
300 V
LineWidthTest
Grid No.2 voltage
1200 V
LineWidthTest
Beam current
10 uA
LineWidthTest