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Specialized - Cathode Ray ·CathodeRay

21AWP4A

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 21AWP4A.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
12N
Socket code
-
Base pins
5
Nominal heater
6.3 V / 600 mA

Description

21AWP4A is a monochrome cathode-ray picture tube for television/display service. The supplied RCA data describes magnetic focusing and magnetic deflection, with a P4 phosphor screen and a published maximum anode/ultor voltage of 20000 V.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12N
Socket code
-
Base pins
5
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12N - 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
20000 V

Cathode-ray electron-gun/screen system; anode/ultor maximum promoted to MaxPlateVoltage when explicitly published. Explicit X-ray warning/precaution or X-radiation characteristic is present in the supplied 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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Heater Voltage

    6.3 V

    Nominal heater voltage

  • Heater Current

    600 mA

    Nominal heater current

  • Phosphor

    P4

    Published phosphor designation

  • External conductive coating to anode

    2500 pF

    External conductive coating to anode 2500 max. pf

  • Anode Voltage

    20000 V

    Anode Voltage 20000 max. volts

  • Grid-No.2 Voltage

    550 V

    Grid-No.2 Voltage 550 max. volts

  • Heater Voltage r6.9 max. volts

    9 V

    Heater Voltage r6.9 max. volts

  • After equipment warm-up period

    200 V

    After equipment warm-up period 200 max. volts

  • Combined AC and DC voltage

    200 V

    Combined AC and DC voltage 200 max. volts

  • Anode Voltage

    18000 V

    Anode Voltage 18000 volts

  • Grid-No.2 Voltage

    400 V

    Grid-No.2 Voltage 400 volts

  • focused raster

    36 to 78 V

    focused raster 36 to 78 volts

  • Grid-No.l-Circuit Resistance

    1.5 MΩ

    Grid-No.l-Circuit Resistance 1.5 max. megohms

Construction

  • Focusing Method

    Magnetic

    Published focusing method

  • Deflection Method

    Magnetic

    Published deflection method

Characteristic

  • MAGNETIC FOCUS

    72 deg

    MAGNETIC FOCUS 72° MAGNETIC DEFLECTION

Capacitance

  • Cathode to all other electrodes

    5 pF

    Cathode to all other electrodes 5 pf

  • Grid No,1 to all other electrodes

    6 pF

    Grid No,1 to all other electrodes 6 pf

  • Heater Current at

    30 mA

    Heater Current at 6.3 volts 600 ± 30 ma

  • Heater Warm-up time (Average)

    11 s

    Heater Warm-up time (Average) 11 seconds

  • Projected Area of Screen

    262 sq in

    Projected Area of Screen 262 sq. in.