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Specialized - Cathode Ray ·CathodeRay

19EBP4

Nineteen-inch rectangular television picture tube with low-voltage electrostatic focus, 114-degree magnetic deflection, aluminized P4 white screen, and no ion trap. Its high-voltage direct-view design carries published X-ray precautions.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B8H
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

19EBP4 — 19-Inch Cathode Ray Tube

The 19EBP4 is a 19-inch cathode ray tube designed for television display applications. It features a 114-degree magnetic deflection angle, electrostatic focusing, and a straight electron gun that does not require an external ion-trap magnet. The tube incorporates a filled-rim implosion protection system and an aluminized P4 sulfide-type phosphor screen.

Mechanical Design and Physical Dimensions

The 19EBP4 is built using the JEDEC J149 F (also designated J-149-F1) glass bulb. It has a short neck design, measuring 4.375  0.125 inches (4 3/8  1/8 inches) in length, which contributes to a compact overall tube length of 11.625  0.250 inches (11 5/8  1/4 inches). The approximate weight of the tube, including its integrated implosion protection hardware, is 16 pounds.

The screen has a projected minimum useful area of 172 square inches, with the following minimum dimensions:

  • Diagonal: 17.562 inches (17 9/16 inches)
  • Greatest Width: 15.188 inches (15 1/8 inches)
  • Greatest Height: 12.000 inches (12 inches)

The greatest external shell dimensions are:

  • Diagonal: 20 7/8  3/32 inches
  • Width: 17 1/8  1/16 inches
  • Height: 14 5/64  1/16 inches

The faceplate is constructed of filterglass with a light transmission rating of approximately 48% to 49% at the center. The screen uses an aluminized P4 sulfide-type phosphor to optimize brightness and contrast.

Electrical Connections and Pinout

The tube utilizes a JEDEC B7-208 Small-Button Neoeightar 7-pin base (Arrangement 1) and is configured according to the JEDEC 8HR basing diagram. The high-voltage anode connection is made via a recessed small cavity cap (JEDEC No. J1-21) located on the bulb cone. This cap aligns with Pin Position No. 4 within a tolerance of 30 degrees.

The pin connections, viewed from the bottom of the base, are as follows:

  • Pin 1: Heater
  • Pin 2: Grid No. 1
  • Pin 3: Grid No. 2
  • Pin 4: Grid No. 4 (Focusing Electrode)
  • Pin 6: Grid No. 1
  • Pin 7: Cathode
  • Pin 8: Heater
  • Cap: Anode (Grid No. 3, Grid No. 5, Screen, Collector / Ultor)
  • External Conductive Coating: Grounding contact area near Reference Line

Installation and Mounting Notes

The socket for the 19EBP4 must not be rigidly mounted. It should be connected using flexible leads to prevent lateral mechanical strain on the base pins. The bottom circumference of the base wafer is designed to fall within a 1.75-inch diameter circle concentric with the bulb axis. Additionally, the external conductive coating must be reliably grounded to the chassis.

Heater and Cathode Ratings

The 19EBP4 is equipped with an indirectly heated cathode. The heater is designed for a nominal operating voltage of 6.3 V, but can tolerate a range from a minimum of 5.7 V to a maximum of 6.9 V.

  • Nominal Heater Voltage: 6.3 V
  • Heater Current: 600  30 mA
  • Average Heater Warm-Up Time: 11 seconds

Heater-Cathode Voltage Limits

To prevent insulation breakdown, specific voltage limits between the heater and cathode must be observed:

  • Heater negative with respect to cathode:
    • During the initial equipment warm-up period (≤ 15 seconds): 450 V maximum.
    • After the warm-up period: 200 V to 300 V maximum.
  • Heater positive with respect to cathode:
    • Combined AC and DC voltage: 200 V maximum.
    • DC component: 100 V maximum.

Interelectrode Capacitances

The direct interelectrode capacitances of the tube are:

  • Cathode to all other electrodes: approximately 5 pF.
  • Grid No. 1 to all other electrodes: approximately 6 pF.
  • External conductive coating to anode: 1,000 to 1,250 pF minimum, and 1,500 to 1,750 pF maximum (measured with the implosion protection hardware connected to the external coating).
  • Resistance between external conductive coating and implosion protection hardware: 50 M̤ minimum.

Design-Maximum Ratings

The following design-maximum ratings represent the absolute limits within which the 19EBP4 must be operated. All voltages are positive with respect to the cathode unless otherwise specified.

  • Anode Voltage: 11,000 to 12,000 V minimum, 23,000 V maximum.
  • Grid No. 4 (Focusing Electrode) Voltage: -500 to -550 V maximum negative, +1,000 to +1,100 V maximum positive.
  • Grid No. 2 Voltage: 200 to 220 V minimum, 550 V maximum.
  • Grid No. 1 Negative Peak Voltage: 220 V maximum.
  • Grid No. 1 Negative Bias Voltage: 154 to 155 V maximum.
  • Grid No. 1 Positive Bias Voltage: 0 V maximum.
  • Grid No. 1 Positive Peak Voltage: 2 V maximum.
  • Grid No. 1 Circuit Resistance: 1.5 M̤ maximum.

Operating Conditions and Drive Services

The 19EBP4 can be operated in either Cathode-Drive or Grid-Drive configurations. The typical operating points for each service illustrate the electrode potentials required to achieve focus and raster extinction.

Cathode-Drive Service

In this configuration, voltages are referenced positive with respect to Grid No. 1:

  • Anode Voltage: 16,000 V
  • Grid No. 4 Voltage: 0 to 400 V (satisfactory focus is achieved within this range)
  • Grid No. 2 Voltage: 300 V
  • Cathode Voltage (for visual extinction of focused raster): 28 to 62 V
  • Required Centering Magnet Field Strength: 0 to 8 Gauss (adjustable)

Grid-Drive Service

In this configuration, voltages are referenced with respect to the cathode:

  • Anode Voltage: 16,000 Vdc
  • Grid No. 4 Voltage: 0 to +400 Vdc
  • Grid No. 2 Voltage: 400 Vdc
  • Grid No. 1 Voltage (for visual extinction of focused raster): -39 to -94 Vdc

Technical Summary

The 19EBP4 is a 19-inch, 114-degree cathode ray tube utilizing electrostatic focusing and magnetic deflection. Its straight-gun design eliminates the need for an ion-trap magnet, simplifying receiver design. With its robust design-maximum ratings, including an anode voltage capability up to 23,000 V, and its dual compatibility with cathode-drive and grid-drive circuitry, the 19EBP4 provides a reliable and versatile display solution for television receivers.

Socket description

Neoeightar 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B8H
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
600 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
23000 V
Max screen voltage
550 V

Filled-rim aluminized P4 cathode-drive picture tube.

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

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Heater Warm-up Time

    11 s

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Horizontal Deflection Angle

    102 deg

  • Vertical Deflection Angle

    85 deg

  • Diagonal Deflection Angle

    114 deg

  • Cathode-to-All Capacitance

    5 pF

    Approximate

  • Grid1-to-All Capacitance

    6 pF

    Approximate

  • External Coating-to-Anode Capacitance Minimum

    1000 pF

  • External Coating-to-Anode Capacitance Maximum

    1500 pF

  • Phosphor

    P4 Aluminized text

  • Fluorescence

    White text

  • Light Transmittance

    49 percent

    ScreenCenter

Data set 02

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

    600 mA

  • Heater warm-up time

    11 s

  • Maximum anode/ultor voltage

    23000 V

  • Minimum anode/ultor voltage

    11000 V

  • Typical anode/ultor voltage

    16000 V

    PictureTubeService

  • Maximum grid No.2 voltage

    550 V

  • Typical grid No.2 voltage

    300 V

    PictureTubeService

  • Focus-voltage range minimum

    0 V

    OptimumFocus

  • Focus-voltage range maximum

    400 V

    OptimumFocus

  • Visual-extinction voltage range minimum

    28 V

    FocusedRasterExtinction

  • Visual-extinction voltage range maximum

    62 V

    FocusedRasterExtinction

  • Maximum grid No.1 circuit resistance

    1.5 megohm

  • X-ray shielding warning

    Present

    HighAnodeVoltage

  • Maximum negative grid No.1 peak voltage

    220 V

  • Maximum negative grid No.1 bias magnitude

    155 V

  • Maximum positive grid No.1 peak voltage

    2 V

  • Peak heater-cathode voltage during warm-up

    450 V

    HeaterNegative;Warmup<=15s

  • Peak heater-cathode voltage after warm-up

    300 V

    HeaterNegative

  • Peak heater-cathode voltage heater positive

    200 V

    HeaterPositive

  • Adjustable centering magnet field strength maximum

    8 gauss

    Approximate

Construction

  • Focusing method

    LowVoltageElectrostatic

  • Deflection method

    Magnetic

  • Phosphor

    P4

  • Screen type

    Aluminized white

    P4

Characteristic

  • Deflection angle

    114 deg

    Approximate

Capacitance

  • Cathode to all other electrodes capacitance

    5 pF

    Approximate

  • External conductive coating to anode capacitance minimum

    1250 pF

    Approximate

  • External conductive coating to anode capacitance maximum

    1750 pF

    Approximate