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19BWP4

Nineteen-inch direct-view monochrome television picture tube with electrostatic focusing, magnetic deflection, and an aluminized P4 screen. Manufacturer documentation places it in the high-voltage picture-tube family used for bright, high-contrast receiver display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B7G
Base pins: -
Nominal heater: 6.3 V / 6 A

Description

19BWP4 Television Picture Tube

The 19BWP4 is a rectangular glass television picture tube designed for television receiver applications. It features a 114-degree magnetic deflection system, low-voltage electrostatic focusing, and an aluminized P4 phosphor screen. The tube is constructed with a short neck, a spherical faceplate, and gray filter glass to improve picture contrast. It does not require an ion trap and includes an external conductive coating that serves as a supplementary filter capacitor when grounded.

Mechanical and Optical Specifications

The 19BWP4 is built using the J149A1 glass bulb template and features a B7-208 base with an 8HR basing configuration. The physical dimensions of the tube are optimized for a compact cabinet footprint, utilizing a short neck design.

Overall Length: 11-3/4 \u00b1 1/4 inches
Neck Length: 4-1/2 \u00b1 1/8 inches
Maximum Neck Diameter: 1.168 inches (at the splice)
Greatest Dimensions:
- Diagonal: 18-5/8 \u00b1 1/8 inches
- Width: 16-13/32 \u00b1 1/8 inches
- Height: 13-11/32 \u00b1 1/8 inches
Minimum Useful Screen Dimensions:
- Diagonal: 17-9/16 inches
- Horizontal: 15-1/8 inches
- Vertical: 12 inches
- Minimum Useful Area: 172 square inches
Weight: 13-1/2 lbs

The faceplate is made of gray filter glass with a light transmittance of approximately 78% at the center, which enhances contrast under ambient lighting conditions.

Heater Ratings and Electrical Connections

The 19BWP4 is equipped with an indirectly heated cathode. The heater is designed for series or parallel operation in television receivers, featuring a controlled warm-up time.

Heater Voltage: 6.3 V
Heater Current: 450 \u00b1 5% mA
Heater Warm-up Time: 11 seconds (the time required to reach 80% of the rated voltage under specified test conditions)

The tube uses the 8HR basing arrangement. The electrical connections are distributed as follows:

Pin Number	Connection
Pin 1	Heater
Pin 2	Grid 1 (Control Grid)
Pin 3	Grid 2 (Screen Grid)
Pin 4	Grid 4 (Focusing Electrode)
Pin 6	Grid 1 (Control Grid)
Pin 7	Cathode
Pin 8	Heater
Recessed Cap	Anode (J1-21 small cavity cap)

The anode connection is made via a recessed small cavity cap (J1-21). The alignment of this cap relative to Pin 4 has an angular tolerance of \u00b130 degrees.

Interelectrode Capacitances

The internal and external capacitances of the 19BWP4 are critical for proper circuit loading and filtering:

Cathode to all other electrodes: Approximately 5 pF
Grid 1 to all other electrodes: Approximately 6 pF
External conductive coating to anode: 1000 pF minimum, 1500 pF maximum

The external conductive coating forms a supplementary high-voltage filter capacitor in conjunction with the internal anode coating. To ensure proper operation and safety, this external coating must be connected to a reliable system ground.

Design-Maximum Ratings

The following design-maximum ratings represent the limiting values of operating conditions for the 19BWP4. All voltages are specified as positive with respect to Grid 1 unless otherwise noted.

Anode Voltage: 23,500 V maximum, 12,000 V minimum
Grid 4 Voltage (Focusing Electrode): +1100 V maximum, -550 V maximum
Grid 2 Voltage: 700 V maximum
Cathode Voltage:
- Maximum Negative DC Value: 0 V
- Maximum Negative Peak Value: 2 V
- Maximum Positive DC Value: 154 V
- Maximum Positive Peak Value: 220 V
Maximum Heater-Cathode Voltage:
- Heater negative with respect to cathode (during warm-up <= 15s): 450 V
- Heater negative with respect to cathode (after warm-up): 200 V
- Heater positive with respect to cathode: 200 V

Typical Operating Conditions (Cathode Drive Service)

Under typical cathode-drive operating conditions, the voltages are referenced positive with respect to Grid 1:

Anode Voltage: 20,000 V DC
Grid 4 Voltage: 250 V DC
Grid 2 Voltage: 500 V DC (operation below 300 V is not recommended)
Cathode Voltage for Raster Cutoff: 45 to 95 V DC

Limiting Circuit Values and Safety

To protect the tube and associated circuitry from damage due to transient arcs or overloads, specific circuit resistance limits must be observed:

Maximum Grid 1 Circuit Resistance: 1.5 M\u2126
Minimum Grid 2 and Grid 4 Circuit Resistance: 10,000 \u2126 (the inclusion of protective resistance in these circuits is strongly advised)

X-Ray Radiation Warning

When operated at anode voltages exceeding 16,000 V, the 19BWP4 can produce very soft X-rays. Depending on the application and operating voltage, appropriate shielding may be required to protect users from exposure.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 6 A
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: 23500 V

Source-derived physical section; applicable promoted ratings are populated from the printed sheet.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Horizontal . . .. v i et i e e
23500 deg
Horizontal . . .. v i et i e e 103 Degrees Maximum Anode Voltage . . ... ... ....... 23500 Volts
Vertical . .ottt e e e e e B6 Degrees Minimum Anode Voitoge (Note
12000 deg
Vertical . .ottt e e e e e B6 Degrees Minimum Anode Voitoge (Note 2} . . ... ... .. 12000 Volts
Diaggonal . . v i i e e e
4 deg
Diaggonal . . v i i e e e 14 Degrees Maximum Grid 4 Voltoge {Focusing
Cathode to oll other electrodes, (Apprax.}
700 V
Cathode to oll other electrodes, (Apprax.} .. . .. 5 put Maximum Grid 2 Voltoge .. ... .0 vy 700 Yolts
Grid
6 V
Grid 1 to oll other electrodes, (Approx.} . .. ... 6 Tyt Cothode Voltage:
Minimum . .. . e e e e e
154 V
Minimum . .. . e e e e e 1000 ik Moximum Positive Valve . .. ... e e 154 Volts DC
Heater Current at
3 V
Heater Current at 6. 3 volts. . . .. ...
... 450 £ 5% Ma. Maximum Positive Peak Value , . ... ... .. 220 Volts
220 V
... 450 £ 5% Ma. Maximum Positive Peak Value , . ... ... .. 220 Volts
Heoter Warm-up Time (Note
11 s
Heoter Warm-up Time (Note 1} ... ... .. 11 Seconds Moximum Heater-Cathode Voltage
Light Tronsmittance ot Center, Appreximate,
450 s
Light Tronsmittance ot Center, Appreximate, .. .. 78 Percent 15 seconds .. .ol 450 Volrs
MECHANICAL: Heater positive with respect to cathode .,
200 V
MECHANICAL: Heater positive with respect to cathode ., .. 200 Volts
Owverall Length,
4 Inches
Owverall Length, . ... ... ....... 11-3/4 £1/4 Inches
Diggonel. . .. ... ... o
8 Inches
Diggonel. . .. ... ... o 0ol 18-5/8 + 1/8 Inches CATHGDE DRIVE SERVICE:
Width. . oo
8 Inches
Width. . oo 16-13/32 £ 1/8 Inches Unless Otherwise Specified, All Yaltage Values
Diagonal
250 Inches
Diagonal . ................ 17916 Inches Grid 4 Voltage (Facusing Electrode) ... ... 250 Volts DC
Horizontal
500 Inches
Horizontal .. .............. 15-1/8 Inches Grid 2 Voltage (Note 3) . . . oo v e oo . 500 Velts DC
.. ... .. 12 Inches Cothode Voltage for raster cutoff ...
12 Inches
.. ... .. 12 Inches Cothode Voltage for raster cutoff ...
.. ... 45 to 95 Volts DC
95 V
.. ... 45 to 95 Volts DC
Neck Length
8 inches
Neck Length .. .. ............ 4:1/2 £1/8 inches LIMITING CIRCUIT VALUES:
BUtb v e e
1.5 Mohm
BUtb v e e 1149A1 Maximum Grid 1 Circuit Resistance .. .... 1.5 Megohms
Basing. ... .. o et BHR voltage acress the heater to reach
80 V
Basing. ... .. o et BHR voltage acress the heater to reach 80% of its rated volue ofter
Weight . . v it it e it s e e
4 V
Weight . . v it it e it s e e 13-1/2 Pounds applying 4 times rated heater voltage to o circuit consisting of
Operation with onoda voltoge less than
12000 V
Operation with onoda voltoge less than 12000 volts in not rec.
3. 1t is recommended that not less than 300 volts on Grid 2 be
2 mm
3. 1t is recommended that not less than 300 volts on Grid 2 be

Characteristic

Ar@g o v v v v i e
5 Inches
Ar@g o v v v v i e 172 5q. Inches
BulbContact. . . .. it ittt e e e e J1
10000 ohm
BulbContact. . . .. it ittt e e e e J1.21 Minimum Grids 2 & 4 Circuit Resistance (Nate 4) 10000 Ohms

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Heater current
450 mA
Maximum anode voltage
23500 V
Maximum grid 2 voltage
700 V
Maximum positive cathode voltage
154 V
Maximum positive peak cathode voltage
220 V
Minimum recommended anode voltage
12000 V
Maximum focusing electrode voltage
1100 V
Positive limit

Capacitance

Cathode to all other electrodes capacitance
5 pF
Grid 1 to all other electrodes capacitance
6 pF