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

21CQP4

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 21CQP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
7FA
Socket code
-
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

A lightweight 21-inch direct-view rectangular glass television picture tube with electrostatic focus, 110-degree magnetic deflection, gray filter glass and an aluminized P4 screen.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7FA
Socket code
-
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7FA - 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
18000 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

  • Voltage (AC or DC)

    6.3 V

    Voltage (AC or DC) 6.3 volts

  • Current

    5 A

    Current 0.6 t 5% amp

  • Warm-up time (Average)

    11 s

    Warm-up time (Average) 11 sec

  • ULTOR VOLTAGE

    18000 V

    ULTOR VOLTAGE. 18000 max. volts

  • GRID-No.2 VOLTAGE

    500 V

    GRID-No.2 VOLTAGE. 500 max. volts

  • respect to cathode

    180 V

    respect to cathode 180 max. volts

  • Grid-No.l-Circuit Resistance

    5 MΩ

    Grid-No.l-Circuit Resistance 1 5 max. megohms

Construction

  • Focusing Method

    Electrostatic

    Published focusing method

  • Deflection Method

    Magnetic

    Published deflection method