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25BP22

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: B14
Base pins: -
Nominal heater: 6.3 V / -

Description

25-inch color television CRT electrically identical to 25AP22 except for removal of the integral protective window.

Socket description

Small-shell Diheptal 14-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B14
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: -
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

Published source ratings and characteristics promoted where applicable; additional electrical and operating data retained as parameters.

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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Application

Application
Cathode-ray display / television / instrumentation

Characteristics

Focusing method
Electrostatic
Deflection method
Magnetic
Deflection angle
90 deg
Light transmission
69 %

Construction

Gun count
3
Screen
P22 aluminized tricolor phosphor-dot shadow-mask
Difference from 25AP22
No integral protective window

Other

Anode voltage minimum
20000 V
Anode voltage maximum
27500 V
Long-term average total anode current maximum
1000 uA
Focus-electrode voltage maximum
6000 V
Grid2 peak voltage maximum
1000 V
Grid1 negative bias maximum
-400 V
Grid1 negative cutoff maximum
-200 V
Grid1 positive peak maximum
2 V
Typical anode voltage
25000 V
Typical focus-electrode voltage range
4200 to 5000 V
Typical grid2 voltage range
285 to 685 V
Typical grid1 cutoff range
-95 to -190 V

Capacitance

Grid1 capacitance per gun
6 pF
All-cathodes capacitance
15 pF
Grid3 capacitance
6.5 pF
External coating capacitance minimum
2000 pF
External coating capacitance maximum
2500 pF