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Specialized - Cathode Ray ·CathodeRay

21CKP4

Large P4 monochrome television picture tube documented for high-voltage direct-view service, using magnetic deflection and manufacturer-specified focusing and beam-control arrangements for type 21CKP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL6
Base pins
6
Nominal heater
6.3 V / 600 mA

Description

21-inch direct-view Phototron television picture tube with electrostatic focus, magnetic deflection, aluminized screen, and an explicit X-ray shielding warning above 16 kV.

Socket description

Small-shell Duodecal 6-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL6
Base pins
6
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 0

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

CRT electrode ratings, focusing/deflection data, capacitances, and operating voltages are preserved 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

1951 Thomas Electronics

Published operating points and test conditions from this source.

SECTION 0

Cathode Ray

Characteristic

  • FocusingMethod

    Electrostatic

  • DeflectionMethod

    Magnetic

  • Deflection Angle

    70 degree

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

Other

  • MaximumMainAnodeOrAcceleratorVoltage

    16000 V

  • TypicalMainAnodeOrAcceleratorVoltage

    16000 V

  • MaximumFocusingElectrodeVoltage

    -500 to 1000 V

  • Maximum Heater Cathode Voltage

    200 V

    AfterWarmup

Capacitance

  • ExternalConductiveCoatingToAnodeCapacitance

    2500 pF

    Maximum