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

5ZP24

Five-inch flying-spot-scanner CRT with electrostatic focusing, magnetic deflection, and a P24 blue-green extremely-short-persistence screen. Its high-voltage anode system is rated to approximately 30 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12A
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Five-inch flying-spot-scanner CRT with electrostatic focus, magnetic deflection, and P24 blue-green, extremely short persistence.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12A
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
30000 V

Published ratings, characteristics, typical operating conditions, and capacitances extracted from supplied Sylvania source.

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

    Magnetic

  • Deflection Angle

    40 degree

  • Phosphor

    P24 blue-green, extremely short persistence

  • MinimumUsefulScreenDiameter

    4.25 in

  • Cathode To All Capacitance

    8 pF

  • Grid1 To All Capacitance

    5 pF

  • ExternalNeckCoatingToAnodeCapacitanceMinimum

    100 pF

  • ExternalNeckCoatingToAnodeCapacitanceMaximum

    500 pF

Other

  • Anode2VoltageMaximum

    30000 V

  • Anode1VoltageMaximum

    7700 V

  • Grid2VoltageMaximum

    385 V

  • Grid1NegativeBiasMagnitudeMaximum

    165 V

  • Grid1PositiveBiasMaximum

    0 V

  • Grid1PositivePeakVoltageMaximum

    2 V

  • HeaterCathodeVoltageMaximum

    450 V

    Warmup<=15s;HeaterNegative

  • HeaterCathodeVoltageMaximum

    165 V

    AfterWarmup;HeaterNegative

  • HeaterCathodeVoltageMaximum

    165 V

    HeaterPositive

  • Anode2Voltage

    27000 V

  • Anode1VoltageForFocus

    5550 to 7050 V

  • Grid2 Voltage

    200 V

  • Grid1VoltageForCutoff

    -42 to -98 V

  • Anode Current

    15 uA

  • Anode1CurrentMaximum

    25 uA

  • Grid2 Current

    -15 to +15 uA

  • Grid1CircuitResistanceMaximum

    1.5 Mohm