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Specialized - Cathode Ray ·CathodeRay

17BJP4

P4 cathode-ray display tube documented for high-voltage direct-view operation, using magnetic deflection and manufacturer-specified beam focusing and control arrangements appropriate to type 17BJP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
B6-63
Socket code
DUODECAL5
Base pins
6
Nominal heater
6.3 V / 600 mA

Description

17BJP4 — Electrostatic-Focus Magnetic-Deflection Cathode Ray Tube

The 17BJP4 is a direct-view rectangular glass picture tube designed for television receiver applications. It features low-voltage electrostatic focusing, a 90-degree magnetic deflection system, and an aluminized screen. The electron gun is designed to operate without requiring an external ion-trap magnet.

Construction and Optical Characteristics

The 17BJP4 is constructed with a rectangular glass bulb and an external conductive coating that provides a regular-band type grounding contact area near the reference line. The screen utilizes an aluminized P-4 sulfide-type phosphor, which produces a white fluorescent and phosphorescent color with short persistence.

To improve picture contrast under ambient light, the tube is equipped with a gray, spherical filterglass faceplate. This faceplate provides a typical light transmission of approximately 74% at the center.

The physical dimensions and screen area of the tube are as follows:

  • Projected Area of Screen: 149 square inches
  • Raster Size: Approximately 14-1/8" x 10-3/8" to 14-1/4" x 10-3/4"
  • Minimum Useful Screen Dimensions:
    • Diagonal: 15-9/16 inches
    • Width: 14-5/16 inches
    • Height: 11-1/8 inches

Mechanical Specifications

The mechanical design of the 17BJP4 incorporates specific physical dimensions and alignment tolerances to facilitate mounting and connection within television chassis:

  • Overall Length: 14-5/8 inches (with a tolerance of ±3/16 to ±3/8 inches)
  • Neck Length: 5-1/2 ± 3/16 inches
  • Greatest Bulb Dimensions:
    • Diagonal: 16-5/8 ± 1/8 inches
    • Width: 15-3/8 ± 1/8 inches
    • Height: 12-9/32 ± 1/8 inches
  • Weight: Approximately 15 lbs.
  • Bulb Contact: Recessed Small Cavity Cap (JEDEC No. J1-21)
  • Base Options: Small-Shell Duodecal 6-Pin (JEDEC Group 4, No. B6-63) or Short Small-Shell Duodecal 6-Pin (JEDEC No. B6-203)
  • Bulb Contact Alignment: The J1-21 anode contact aligns with pin position #6 within a tolerance of ±30 degrees.

Electrical Connections and Basing

The 17BJP4 uses the 12L basing configuration (viewed from the bottom). The pin assignments and electrode connections are detailed below:

Pin / CapConnection
Pin 1Heater
Pin 2Grid No. 1 (Control Grid)
Pin 6Grid No. 4 (Focusing Electrode)
Pin 10Grid No. 2 (Screen Grid)
Pin 11Cathode
Pin 12Heater
Anode CapGrid No. 3, Grid No. 5, Screen, Collector
Coating (C)External Conductive Coating

Heater Ratings and Interelectrode Capacitances

The unipotential cathode is indirectly heated. The heater and interelectrode capacitance values are specified as follows:

  • Heater Voltage (Typical): 6.3 V
  • Heater Voltage Limits (Design-Maximum): 5.7 V minimum to 6.9 V maximum
  • Heater Current: 0.6 A nominal (600 ± 30 mA at 6.3 V)
  • Cathode to all other electrodes capacitance: 5 pF
  • Grid No. 1 to all other electrodes capacitance: 6 pF
  • External conductive coating to anode capacitance: 1500 pF maximum, with a minimum limit of 1000 to 1200 pF

Deflection and Focus

The tube utilizes magnetic deflection and electrostatic focusing. The approximate deflection angles are:

  • Horizontal: 85 degrees
  • Vertical: 68 degrees
  • Diagonal: 90 degrees

The electrostatic focusing system is controlled via Grid No. 4, which operates at low voltages relative to the high-voltage anode.

Maximum Ratings

The operating limits of the 17BJP4 are defined under both the Design Center System and the Design-Maximum System. These limits must be observed to prevent degradation of performance or premature tube failure.

Design Center System Ratings

  • Maximum DC Anode Voltage: 16,000 V (Anode voltage should not be operated below 12,000 V to prevent a decrease in brilliance and definition)
  • Maximum DC Grid No. 4 Voltage: -500 to +1000 V
  • Maximum DC Grid No. 2 Voltage: 500 V
  • Maximum Grid No. 1 Voltage:
    • DC Negative-Bias Value: 140 V
    • DC Positive-Bias Value: 0 V
    • Positive-Peak Value: 0 V
  • Maximum DC Peak Heater-Cathode Voltage:
    • Heater negative with respect to cathode during warm-up (not to exceed 15 seconds): 410 V
    • Heater negative with respect to cathode after warm-up: 180 V
    • Heater positive with respect to cathode: 180 V

Design-Maximum System Ratings

  • Anode Voltage: 17,500 V maximum, 11,000 V minimum
  • Grid No. 4 (Focusing) Voltage: Positive 1100 V maximum, Negative 550 V maximum
  • Grid No. 2 Voltage: 550 V maximum
  • Grid No. 1 Voltage:
    • Negative peak: 220 V maximum
    • Negative bias: 155 V maximum
    • Positive bias: 0 V maximum
    • Positive peak: 2 V maximum
  • Peak Heater-Cathode Voltage:
    • Heater negative to cathode (during warm-up <= 15 seconds): 450 V maximum
    • Heater negative to cathode (after warm-up): 200 V maximum
    • Heater positive to cathode: 200 V maximum (combined AC & DC), 100 V maximum (DC component)
  • Maximum Grid No. 1 Circuit Resistance: 1.5 MΩ

Typical Operating Conditions (Grid-Drive Service)

In typical grid-drive television applications, the 17BJP4 operates under the following conditions (with voltages specified positive with respect to the cathode):

  • DC Anode Voltage: 14,000 V
  • DC Grid No. 4 Voltage: -55 to +300 V
  • DC Grid No. 2 Voltage: 300 V
  • DC Grid No. 1 Voltage (for visual extinction of focused raster): -28 to -72 V

These operating parameters ensure proper focus and raster brightness control, with Grid No. 4 adjusted within its specified range to achieve optimum electrostatic focus across the screen.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B6-63
Socket code
DUODECAL5
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B6-63 - 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
16000 V
Max screen voltage
550 V

CRT-specific anode, focus, deflection and optical data retained as parameters rather than forced into ordinary plate/screen fields.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum Anode Voltage

    16000 V

  • Typical Anode Voltage

    14000 V

  • Maximum Grid2 Voltage

    400 V

  • Typical Grid2 Voltage

    300 V

Characteristic

  • FocusingMethod

    Electrostatic

  • DeflectingMethod

    Magnetic

  • DiagonalDeflectionAngleApproximate

    90 degree

  • PhosphorNumber

    4

  • FluorescentColor

    White

  • Persistence

    Medium

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum DC grid 2 voltage

    500 V

  • Maximum DC grid 4 voltage

    -500 to 1000 V

  • Maximum grid 1 negative-bias voltage

    140 V

    NegativeBias

  • Maximum grid 1 positive-bias voltage

    0 V

    PositiveBias

  • Maximum grid 1 positive-peak voltage

    2 V

    PositivePeak

  • Peak heater-cathode voltage

    410 V

    HeaterNegativeWarmup

  • Peak heater-cathode voltage

    180 V

    HeaterNegativeAfterWarmup

  • Peak heater-cathode voltage

    180 V

    HeaterPositive

  • DC anode voltage

    14000 V

    TypicalOperation

  • DC grid 4 voltage

    -55 to 300 V

    TypicalOperation

  • DC grid 2 voltage

    300 V

    TypicalOperation

  • DC grid 1 voltage

    -28 to -72 V

    TypicalOperation

  • Faceplate transmission at center

    74 %

    Approximate

Characteristic

  • Horizontal deflection angle

    85 degrees

    Approximate

  • Vertical deflection angle

    68 degrees

    Approximate

  • Diagonal deflection angle

    90 degrees

    Approximate

Capacitance

  • Cathode to all other electrodes capacitance

    5 pF

    Approximate

  • Grid 1 to all other electrodes capacitance

    6 pF

    Approximate

  • External conductive coating to anode capacitance

    1500 pF

    Maximum

  • External conductive coating to anode capacitance

    1200 pF

    Minimum

Data set 03

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • LOW-YOLTAGE ELECTROSTATIC FOCUS

    90 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid No.l to all other electrodes

    6 pF

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 1

    6.3 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 2

    600 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 3

    30 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Light transmission (Approx.)

    74

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Projected Area of Screen

    149

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Pi n

    1

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • ANODE VOLTAGE

    111000 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • HEATER VOLTAGE

    15.7 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Anode Voltage

    14000 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.4 Voltage — published value 1

    -55 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.4 Voltage — published value 2

    300 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.2 Voltage

    300 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • focused raster — published value 1

    -28 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • focused raster — published value 2

    -72 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

Other

  • External conductive coating to anode

    1500 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • GRID-No.2 VOLTAGE

    550 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Combined AC and DC voltage

    200 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.l-Circuit Resistance

    1.5 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.