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7JP7

Seven-inch direct-view CRT with electrostatic focusing and deflection, clear faceplate, and a P7 long-persistence screen. Sylvania documentation gives anode capability around 2.8 kV for persistent display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: DIHEPTAL12
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Seven-inch direct-view CRT with electrostatic focus and electrostatic deflection, P7 long-persistence screen, and clear faceplate.

Socket description

Medium-shell Diheptal 12-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: DIHEPTAL12
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 600 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

Max plate voltage: 2800 V

CRT electron-gun/display 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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum plate/anode voltage
2800 V
Published maximum plate/anode voltage
Focusing Anode Voltage
2800 V
Focusing Anode Voltage 2,800 Volts dc
Anode and Any Deflecting Plates
750 V
Anode and Any Deflecting Plates . . . 750 Volts
Anode voltage
6000 V
Anode voltage ........ . 6,000 Volts dc
Focusing Anode voltage
-2400 V
Focusing Anode voltage .... . 1,620-2,400 Volts dc
Horizontal plates.?
177 V
Horizontal plates.? .... .... 177 Volts dc,'Inch
Grid No. 1 Circuit Resistance
1.5 Mohm
Grid No. 1 Circuit Resistance . . 1.5 Megohms Max.
Deflection circuit Resistance
5 Mohm
Deflection circuit Resistance ..,... 5.0 Megohms M,ix. JUI.Y 1953

Characteristic

Heater current
600 mA
Published heater current
Heater voltage
6.3 V
Heater voltage .......... . 6.3 Volts
Heater current (approx.)
600 mA
Heater current (approx.) ....... ..... 0.6 Ampere