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

25BCP22

Twenty-five-inch color television picture tube with three electrostatically focused guns, magnetic convergence/deflection, and an aluminized P22 tricolor screen. High-voltage direct-view construction and shadow-mask color presentation place it firmly in color receiver service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL12
Base pins
-
Nominal heater
6.3 V / 900 mA

Description

25-inch rectangular color picture tube with electrostatic focus, magnetic convergence/deflection, and P22 tricolor rare-earth phosphor screen.

Socket description

Duodecal 12-contact color CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL12
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
900 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
27500 V
Max screen voltage
1000 V

Three-gun color CRT; electrostatic focus and magnetic deflection.

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

  • Heater current

    900 mA

    ThreeGuns

  • Maximum anode voltage

    27500 V

  • Maximum focusing-electrode voltage

    6000 V

  • Typical anode voltage

    25000 V

    ColorPictureTube

  • Focusing-electrode voltage minimum

    16.8 % of anode

    FocusRange

  • Focusing-electrode voltage maximum

    20 % of anode

    FocusRange

  • X-ray shielding warning

    Present

    HighAnodeVoltage

Construction

  • Focusing method

    Electrostatic

  • Focus lens

    Bipotential

  • Convergence method

    Magnetic

  • Deflection method

    Magnetic

  • Phosphor

    P22

    Tricolor

Characteristic

  • Persistence

    Medium Short