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Specialized - Cathode Ray ·CathodeRay

5AQP7B

Five-inch special-purpose instrument CRT with electrostatic focusing and deflection and a P7 aluminized blue-white/yellow long-persistence screen. Its direct-view electrostatic beam system is suited to oscillographic and precision measurement displays.

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

Description

Sylvania 5-inch cathode-ray tube with electrostatic focus, electrostatic deflection, and P7 blue-white/yellow, long persistence, aluminized. 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
4400 V

Published CRT maximum ratings, capacitances, and typical operating conditions extracted from supplied Sylvania datasheet.

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, aluminized

  • MinimumUsefulScreen

    4 x 4 in

  • LineWidthMaximum

    0.03 in

  • PatternDistortionMaximum

    1 %

Other

  • FinalAnodeVoltageMaximum

    4400 V

  • FocusElectrodeVoltageMaximum

    1650 V

  • FinalAnodeVoltage

    2500 V

  • FocusElectrodeVoltageForFocus

    0 to 300 V

  • GridVoltageForCutoff

    -34 to -56 V

  • GridCircuitResistanceMaximum

    1.5 Mohm

  • DeflectionFactorPlates1_2

    40 to 50 V/in

  • DeflectionFactorPlates3_4

    31.5 to 38.5 V/in

  • Anode2PowerInputMaximum

    6 W

  • GridNegativeBiasMagnitudeMaximum

    220 V

  • PeakVoltageAnode2ToDeflectionPlate

    400 V