Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

17CGP4

Seventeen-inch aluminized direct-view television picture tube with electrostatic focusing and magnetic deflection. The unipotential electron gun and high-voltage anode system are supported by published optical and operating-condition data.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
E6-6
Socket code
DUODECAL5
Base pins
6
Nominal heater
6.3 V / -

Description

17CGP4 — Direct-View Television Picture Tube

The 17CGP4 is a direct-view rectangular glass cathode ray tube (CRT) designed for television applications. It features an aluminized screen, electrostatic focus, magnetic deflection, a unipotential cathode, an external conductive coating, and a gray filter faceplate. The tube is designed to operate without the need for an ion trap.

Mechanical Specifications and Physical Dimensions

The 17CGP4 is constructed with a rectangular glass bulb. Its physical dimensions and screen specifications are as follows:

  • Overall Length: 17-3/16 inches ± 3/8 inch
  • Greatest Bulb Dimensions:
    • Diagonal: 16-5/8 inches ± 1/8 inch
    • Width: 15-3/8 inches ± 1/8 inch
    • Height: 12-1/4 inches ± 1/8 inch
  • Minimum Useful Screen Dimensions:
    • Diagonal: 15-9/16 inches
    • Width: 14-5/16 inches
    • Height: 11-1/8 inches
  • Approximate Raster Size: 14-5/16 inches by 10-1/8 inches

Tube Base and Bulb Contact Alignment

The tube uses a Small Shell Duodecal 6-Pin base (designation B6-63) with a 12L basing configuration. The high-voltage anode connection is made via a Recessed Small Cavity Cap (designation J1-21). The J1-21 contact is aligned with pin position #6 within a tolerance of ±30 degrees.

Pin Connections

The bottom-view pin connections for the 12L basing arrangement are:

PinConnection
Pin 1Heater
Pin 2Grid No. 1
Pin 6Grid No. 4
Pin 10Grid No. 2
Pin 11Cathode
Pin 12Heater
Anode CapGrid No. 3, Grid No. 5, Anode

Electrical and Optical Characteristics

The 17CGP4 utilizes electrostatic focusing and magnetic deflection. The deflection angles are approximately:

  • Horizontal Deflection Angle: 65 degrees
  • Diagonal Deflection Angle: 70 degrees

Optical Data

The screen is coated with P-4 sulfide-type phosphor, which produces a white fluorescent color and a white phosphorescent color with medium persistence. The gray filter faceplate has an approximate light transmission of 74% at its center.

Direct Interelectrode Capacitances

The direct interelectrode capacitances of the tube are:

  • Cathode to all other electrodes: 5 µµF (approximate)
  • Grid #1 to all other electrodes: 6 µµF (approximate)
  • External conductive coating to anode: 500 µµF minimum to 750 µµF maximum

Design Center Ratings

The maximum ratings for the 17CGP4 are established under the Design Center System:

  • Heater Voltage: 6.3 Volts
  • Heater Current: 0.6 Ampere ± 10%
  • Maximum DC Anode Voltage: 14,000 Volts
  • Maximum DC Grid #4 Voltage: -500 to +1000 Volts
  • Maximum DC Grid #2 Voltage: 500 Volts
  • Maximum Grid #1 Voltage:
    • DC Negative-bias value: 125 Volts
    • DC Positive-bias value: 0 Volts
    • Positive-peak value: 2 Volts
  • Maximum DC Peak Heater-Cathode Voltage:
    • Heater negative with respect to cathode:
      • During warm-up period (not to exceed 15 seconds): 410 Volts
      • After equipment warm-up period: 180 Volts
    • Heater positive with respect to cathode: 180 Volts
  • Maximum Grid #1 Circuit Resistance: 1.5 Megohms

Typical Operating Conditions

Under typical operating conditions, the 17CGP4 is configured with the following electrical parameters:

  • DC Anode Voltage: 11,000 Volts
  • DC Grid #4 Voltage: -56 to +310 Volts
  • DC Grid #2 Voltage: 300 Volts
  • DC Grid #1 Voltage (for visual extinction of focused raster): -28 to -72 Volts

Technical Summary

The 17CGP4 is a rectangular glass picture tube designed for direct-view television applications. It features electrostatic focusing, magnetic deflection (65° horizontal, 70° diagonal), and a P-4 sulfide-type white phosphor screen. Operating typically at an anode voltage of 11,000 Volts, the tube provides a reliable display without requiring an ion trap. It utilizes a standard 6.3 V heater, a small shell duodecal 6-pin base, and a J1-21 recessed cavity cap for high-voltage anode connection.

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
E6-6
Socket code
DUODECAL5
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
-
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E6-6 - 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 screen voltage
500 V

CRT electron-gun/display section; published electrode ratings promoted where unambiguous.

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

  • Heater voltage

    6.3 V

    Nominal

  • Anode voltage

    14 V

    Published CRT operating condition

  • Grid 2 voltage

    500 V

    Published CRT operating condition

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 Grid No. 2 voltage

    500 V

    Published maximum Grid No. 2 voltage

  • FACEPLATE TRANSMISSION AT CENTER (APPR OX.)

    74 %

    FACEPLATE TRANSMISSION AT CENTER (APPR OX.): 74 PERCENT

  • HEATER VOLTAGE

    6.3 V

    HEATER VOLTAGE 6.3 VOLTS

  • MAXIMUM DC ANODE VOLTAGE

    14000 V

    MAXIMUM DC ANODE VOLTAGE 14 OOO VOLTS

  • MAXIMUM DC GRID #2 VOLTAGE

    500 V

    MAXIMUM DC GRID #2 VOLTAGE 5OO VOLTS

  • HEATER POSITIVE WITH RESPECT TO CATHODE 1$

    0 V

    HEATER POSITIVE WITH RESPECT TO CATHODE 1$O VOLTS

  • DC ANODE VOLTAGE

    11000 V

    DC ANODE VOLTAGE 11 OOO VOLTS

  • DC GRID #2 VOLTAGE

    300 V

    DC GRID #2 VOLTAGE 300 voLTs

  • DC GRID #1 VOLTAGE A -2$ TO

    -72 V

    DC GRID #1 VOLTAGE A -2$ TO -72 VOLTS

Characteristic

  • CATHODE TO ALL OTHER ELECTRODES

    5 ΜΜF

    CATHODE TO ALL OTHER ELECTRODES 5 µµf

  • GRID #i TO ALL OTHER ELECTR bDES

    6 ΜΜF

    GRID #i TO ALL OTHER ELECTR bDES 6 µµf

  • MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    750 ΜΜF

    MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE 750 µµf

  • MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    500 ΜΜF

    MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE 500 µµf