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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

7AEP7

Seven-inch P7 cathode-ray instrument tube for oscillographic or measurement display, with manufacturer-specified focusing, deflection, accelerating-voltage, and phosphor characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DIHEPTAL12
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Sylvania seven-inch CRT with electrostatic focus, electrostatic deflection, and P7 blue-white/yellow, long persistence. Published electrical ratings, capacitances, and operating conditions were extracted from the supplied datasheet.

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
8800 V

Published Sylvania CRT voltage ratings, capacitances, focusing/deflection, and typical operating conditions extracted.

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

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • FocusingMethod

    Electrostatic

  • DeflectionMethod

    Electrostatic

  • Phosphor

    P7 blue-white/yellow, long persistence

  • MinimumUsefulScreen

    6.25 in

  • PatternDistortionMaximum

    2.5 %

  • DeflectionFactorUniformityMaximum

    3 %

  • ModulationMaximum

    37 V

    BeamCurrent=25uA

  • LineWidthMaximum

    0.022 in

    BeamCurrent=25uA

Other

  • Grid1CircuitResistanceMaximum

    1.5 Mohm

  • Anode3VoltageMaximum

    8800 V

  • Anode2VoltageMaximum

    4400 V

  • Anode3ToAnode2VoltageRatioMaximum

    2

  • Anode1FocusVoltageMaximum

    1375 V

  • Grid1NegativeBiasMagnitudeMaximum

    220 V

  • HeaterCathodeVoltageMaximum

    200 V

  • PeakVoltageAnode2ToDeflectionPlate

    825 V

  • Anode3Voltage

    4000 V

  • Anode2Voltage

    2000 V

  • Anode1VoltageForFocus

    380 to 620 V

  • Grid1VoltageForCutoff

    -45 to -75 V

  • DeflectionFactorD1D2

    81 to 101 V/in

  • DeflectionFactorD3D4

    67 to 83 V/in