19VBRP22 — Ultra-Rectangular Color Picture Tube

The 19VBRP22 is an ultra-rectangular color picture tube featuring a 4x3 aspect ratio, designed for television display applications. It incorporates a Hi-Lite Matrix Screen with an aluminized backing and a black opaque matrix material, providing a light neutral screen appearance. The screen utilizes a P22 phosphor system consisting of rare-earth red and sulfide blue and green phosphors, which exhibit medium-short persistence. The phosphor array is composed of approximately 382,000 dot trios with a spacing of 0.024 inches (0.61 mm) between adjacent trios.

The tube is equipped with three electron guns (red, green, and blue) arranged in a Delta configuration, with their axes tilted toward the tube axis. It utilizes electrostatic focusing via a bipotential focus lens, while convergence and deflection are achieved magnetically. The deflection angles are 90° diagonally, 78° horizontally, and 60° vertically. Implosion protection is provided by integrated rim bands and a tension band.

Mechanical and Physical Specifications

The physical construction of the 19VBRP22 is defined by standardized JEDEC designations for its envelope components and electrical interfaces:

• Bulb Funnel: JEDEC No. J510A06
• Bulb Panel: JEDEC No. FP161-3/4 W1
• Base: Small-Button Diheptar 12-Pin (JEDEC No. B12-244)
• Basing Arrangement: JEDEC No. 14BE
• Anode Contact: JEDEC No. J1-21
• Operating Position: The preferred operating position is with the anode bulb contact positioned on top.
• Weight: Approximately 25 lb (11.4 kg)
• Minimum Projected Screen Area: 185 sq in (1194 sq cm)

Heater Ratings and Standby Operation

The 19VBRP22 heater is designed for both standard and standby operation modes. Under typical operating conditions without standby, the nominal heater voltage is 6.3 V with a current draw of 900 mA.

When standby operation is utilized, a standby voltage of 5.0 V is recommended (with a Design-Maximum limit of 5.5 V). When this 5.0 V standby mode is employed, the active operating voltage is reduced to 6.0 V. The heater surge voltage must be limited to a maximum of 9.5 V rms.

Pinout and Interelectrode Capacitances

The JEDEC No. 14BE basing arrangement provides the following electrical connections, viewed from the bottom of the base:

The external conductive coating forms a capacitor with the internal anode structure. The interelectrode capacitances and associated electrical characteristics are:

Design-Maximum Ratings

The Design-Maximum ratings represent the limiting values of operating and environmental conditions for each gun of the 19VBRP22:

• Anode Voltage: 20 kV min, 27.5 kV max
• Anode Current (Long-Term Average): 1000 µA max (short-term average is limited to 1500 µA)
• Grid-No. 3 (Focus) Voltage: 6000 V max
• Peak Grid-No. 2 Voltage (including video signal): 1000 V max
• Grid-No. 1 Voltage:
  • Negative bias value: 400 V max
  • Negative operating cutoff value: 200 V max
  • Positive bias value: 0 V max
  • Positive peak value: 2 V max
• Heater Voltage (AC or DC):
  • Operating: 5.7 V min, 6.9 V max
  • Standby: 5.5 V max
• Heater-Cathode Voltage:
  • Heater negative to cathode: 450 V max during warm-up (≤15 s); 200 V max DC / 200 V max peak after warm-up
  • Heater positive to cathode: 0 V max DC, 200 V max peak

Typical Characteristics and Equipment Design Ranges

The operating characteristics and alignment parameters for the 19VBRP22 are detailed below:

• Focusing Voltage: Grid-No. 3 voltage ranges from 16.8% to 20% of the applied anode voltage.
• Grid-No. 2 Voltage for Visual Extinction:
  • At Grid-No. 1 voltage ($V_{g1}$) of -75 V: 80 to 280 V
  • At $V_{g1}$ of -125 V: 215 to 550 V
  • At $V_{g1}$ of -175 V: 355 to 820 V
• Grid-No. 2 Voltage Ratio: The ratio of the highest to lowest gun Grid-No. 2 voltage is 1.86 max (at a Grid-No. 1 spot cutoff of -100 V).
• Electrode Currents: Grid-No. 3 total current is ±15 µA; Grid-No. 2 and Grid-No. 1 currents are each ±5 µA.
• Typical Light Output: 80 fL (274 Nit) measured within a 4-inch diameter area under the following conditions: anode voltage of 25 kV, anode current of 1000 µA, Grid-No. 3 adjusted for focus, and a color temperature of 9300 K + 27 M.P.C.D.

White Light Color Coordinates and Gun Currents

The tube can be set up for different white points, which alter the required anode current distribution and cathode current ratios:

1. Illuminant D (6550 K + 7 M.P.C.D.):
   • Coordinates: x = 0.313, y = 0.329
   • Anode Current Distribution: Red 41%, Blue 24%, Green 35%
   • Cathode Current Ratios:
     • Red/Blue: 1.35 min, 1.70 typ, 2.20 max
     • Red/Green: 0.95 min, 1.15 typ, 1.70 max
     • Blue/Green: 0.50 min, 0.70 typ, 0.95 max
2. Color Temperature 9300 K + 27 M.P.C.D.:
   • Coordinates: x = 0.281, y = 0.311
   • Anode Current Distribution: Red 30%, Blue 31%, Green 39%
   • Cathode Current Ratios:
     • Red/Blue: 0.75 min, 0.96 typ, 1.25 max
     • Red/Green: 0.60 min, 0.75 typ, 1.10 max
     • Blue/Green: 0.60 min, 0.80 typ, 1.10 max

Beam Displacements (at Screen Center)

• Raster centering: ±0.45 in (±1.4 mm) horizontal and vertical
• Lateral blue beam displacement relative to converged red/green: ±0.25 in (±6.4 mm)
• Radial convergence (each beam): ±0.37 in (±9.4 mm)
• Maximum register correction: 0.005 in (0.13 mm) max

Limiting Circuit Values and Safety

To ensure stable operation and prevent damage, the following maximum circuit resistances must be maintained:

• Grid-No. 3 Circuit Resistance: 7.5 MΩ max
• Effective Grid-No. 1-to-Cathode Circuit Resistance (each gun): 0.75 MΩ max

X-Radiation Characteristics

The 19VBRP22 complies with safety standards regarding X-radiation. Under Design-Maximum ratings (anode voltage of 27.5 kV and anode current of 1000 µA), X-radiation does not exceed 0.5 mR/h. The maximum anode voltage permitted to guarantee X-radiation levels at or below 0.5 mR/h at an anode current of 300 µA is 33 kV.

Qualitative Analysis of Characteristics and Curves

The performance and safety boundaries of the 19VBRP22 are illustrated by several key relationships:

• Isodose-Rate Limit: The 0.5 mR/h X-radiation boundary exhibits a downward slope, indicating that the maximum safe anode voltage decreases as the anode current increases. Specifically, the safe limit drops from 35 kV at 100 µA to approximately 30.5 kV at 1100 µA.
• X-Radiation vs. Voltage: At a constant anode current of 300 µA, X-radiation emission increases sharply and non-linearly once the anode voltage exceeds 31 kV.
• Drive Characteristics: Both grid-drive and cathode-drive characteristics display a typical power-law increase of anode current per gun in response to the video signal voltage. These relationships are plotted across spot cutoffs ranging from 50 V to 200 V.
• Cutoff Design Chart: The relationship between Grid-No. 1-to-Cathode voltage (0 to -200 V) and Grid-No. 2-to-Cathode voltage (-120 to 1000 V) is bounded by linear minimum and maximum spot cutoff limits for any given gun.

Technical Summary

The 19VBRP22 is a 90° diagonal color picture tube featuring an ultra-rectangular 4x3 aspect ratio, a Hi-Lite Matrix Screen, and a P22 rare-earth/sulfide phosphor array. It utilizes a three-gun delta configuration with electrostatic bipotential focusing and magnetic deflection. Operating with a typical 6.3 V / 900 mA heater (or a 6.0 V active / 5.0 V standby configuration), it is rated for a maximum anode voltage of 27.5 kV and a long-term average anode current of 1000 µA. The tube delivers a typical light output of 80 fL at 25 kV and is fully compliant with X-radiation safety limits under its Design-Maximum ratings.