Specialized - Cathode Ray ·CathodeRay
Direct-view 14-inch three-gun shadow-mask color television picture tube. Its multi-gun color-display construction and high-voltage operation distinguish it from monochrome CRTs and place it squarely in color television receiver service.
A directly viewed, 14-inch rectangular glass picture tube featuring a three-gun shadow mask system, electrostatic focusing, magnetic deflection, and an aluminized sulfide-type phosphor screen for color television receivers.
The 14BCP22 is a specialized 14-inch rectangular glass cathode-ray tube designed for displaying either full-color or black-and-white television pictures. It provides a minimum useful screen area of 100 square inches, with a rectangular image measuring 9-1/8 inches by 11-27/32 inches.
The design incorporates a three-gun shadow mask system with axes tilted toward the tube axis, a graded-hole shadow mask, and a high-efficiency sulfide-group phosphor screen. These features simplify color-field setup, improve image sharpness on rapid-action scenes, and significantly increase screen brightness compared to contemporary larger color tubes.
The 14BCP22 utilizes three independent electron guns aligned with the blue, green, and red color channels. The screen is coated with P22-A11 aluminized sulfide-type phosphors arranged in a triangular dot configuration of blue, green, and red dots.
This phosphor system and mask design offer several distinct advantages:
The 14BCP22 is housed in a rectangular glass bulb with the following physical dimensions and tolerances:
| Dimension | Value |
|---|---|
| Overall Length | 19-9/32 ± 3/8 inches |
| Greatest Diagonal | 14 ± 1/8 inches |
| Greatest Width | 13-1/16 ± 1/8 inches |
| Greatest Height | 10-9/16 ± 1/8 inches |
| Neck Length | 9-9/16 ± 1/4 inches |
| Minimum Useful Screen Diagonal | 12-19/32 inches |
| Minimum Useful Screen Width | 11-27/32 inches |
| Minimum Useful Screen Height | 9-1/8 inches |
| Minimum Useful Screen Area | 100 sq. inches |
The tube is equipped with a B12-131 small shell Neodiheptal 12-pin base and a J1-21 recessed small cavity cap for the ultor terminal. The reference line is determined by the intersection of plane CC' of a standard neck-funnel-contour gauge when seated against the glass funnel.
For proper installation, the socket for the B12-131 base must not be rigidly mounted; it should have flexible leads and be allowed to move freely. The bottom circumference of the base shell falls within a 3-inch diameter circle concentric with the bulb axis. The external conductive coating must be grounded, and its contact band is positioned to provide the required capacitance. The insulating coating area of the bulb should be cleaned only by wiping with a soft, dry, lintless cloth.
The 14BCP22 operates with electrostatic focusing, magnetic convergence, and magnetic deflection. The approximate deflection angles are:
| Parameter | Value |
|---|---|
| Nominal Heater Voltage | 6.3 V |
| Nominal Heater Current | 1.8 A |
| Heater Warm-up Time | 11 seconds |
All voltage values are positive and measured with respect to the cathode, unless otherwise specified.
| Parameter | Rating |
|---|---|
| Maximum Anode Voltage | 22,000 Volts |
| Minimum Anode Voltage | 12,000 Volts |
| Maximum Grid No. 3 Voltage | 5,300 Volts |
| Maximum Grid No. 2 Voltage | 650 Volts |
| Grid No. 1 Maximum Negative DC Voltage | 400 Volts |
| Grid No. 1 Maximum Positive DC Voltage | 0 Volts |
| Grid No. 1 Maximum Positive Peak Voltage | 2 Volts |
| Maximum Heater Voltage | 6.9 Volts |
| Minimum Heater Voltage | 5.7 Volts |
| Heater-Cathode Voltage (Heater Negative to Cathode) | |
| — During warm-up period (not to exceed 15 seconds) | 450 Volts |
| — After equipment warm-up period | 200 Volts |
| Heater-Cathode Voltage (Heater Positive to Cathode) | 200 Volts |
Under typical operating conditions, the tube is configured with the following parameters:
To produce a standard white light of 9,300°K + 27 M.P.C.D. (CIE Coordinates x = 0.281, y = 0.311), the average percentage of total ultor current supplied by each gun is:
The ratio of cathode currents required to produce this white point varies within the following ranges:
The 14BCP22 uses a 12-pin Neodiheptal base with the 14AU basing diagram. The pin connections, viewed from the bottom of the base, are as follows:
Dimagnal 22-contact CRT collar-base family
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
3 physical sections, with 1 unique section. The remaining sections have identical specifications.
Section 1
Repeated identical physical sections represented by one populated row.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Interelectrode capacitances published
1
See source table
Heater Warm-up Time
11 s
Maximum Anode Voltage
22000 V