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17CDP4

Seventeen-inch aluminized direct-view television picture tube with electrostatic focusing, magnetic deflection, and an external ion-trap arrangement. Its unipotential electron gun and high-voltage anode system are designed for monochrome receiver display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: DUODECAL5
Base pins: -
Nominal heater: 8.4 V / 450 mA

Description

17CDP4 — Electrostatic-Focus Magnetic-Deflection Cathode Ray Tube

The 17CDP4 is a very short, direct-view rectangular glass picture tube designed for television receiver applications. It features low-voltage electrostatic focusing and wide-angle magnetic deflection. The tube incorporates an aluminized screen with a white-emitting phosphor, a neutral gray filterglass faceplate to enhance picture contrast, and an external conductive bulb coating that serves as a supplementary high-voltage filter capacitor when grounded.

The electron gun is a straight-type design that does not require an ion-trap magnet. The 17CDP4 is designed with a controlled heater warm-up time, making it suitable for use in television receivers employing series-connected heater strings.

Physical and Optical Construction

The 17CDP4 is housed in a rectangular glass envelope designated as bulb number J132-1/2. It has a nominal neck diameter of 1-1/8 inches and a neck length of 5-7/16 ± 1/8 inches. The physical dimensions of the bulb are:

Overall Length: 12-9/16 ± 1/4 inches
Greatest Diagonal: 16-9/16 ± 1/8 inches
Greatest Width: 15-5/8 ± 1/8 inches
Greatest Height: 12-3/4 ± 1/8 inches

The screen itself provides a minimum useful projected area of 155 square inches, with the following minimum dimensions:

Diagonal: 15-3/4 inches
Width: 14-3/4 inches
Height: 11-11/16 inches

Optical Characteristics

The screen utilizes a P-4 sulfide-type phosphor, which exhibits white fluorescence and phosphorescence with a short persistence. The faceplate is a spherical neutral gray filterglass with an approximate light transmission of 78% at the center, which reduces ambient light reflections and improves contrast.

Deflection and Focusing

The tube utilizes magnetic deflection with wide deflection angles to minimize overall length:

Diagonal Deflection Angle: 110°
Horizontal Deflection Angle: 105°
Vertical Deflection Angle: 87°

Focusing is achieved electrostatically via Grid No. 4, which operates at low voltages relative to the high-voltage anode.

Heater and Electrical Connections

The 17CDP4 is equipped with a unipotential cathode and a heater designed for either AC or DC operation. The heater has a controlled warm-up characteristic to ensure reliable operation in series-string heater circuits.

Heater Ratings

Heater Voltage: 8.4 V
Heater Current: 0.45 A
Warm-up Time: Approximately 11.0 seconds

Pinout and Basing

The tube uses a Small-Button Eightar 7-Pin base (Style B, JETEC No. B7-183) with an indexing plug, designated as basing configuration 8HR. High-voltage connection to the anode (comprising Grid No. 3, Grid No. 5, and the internal collector) is made via a recessed small cavity cap (JETEC No. J1-21) located on the bulb cone. The anode 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	Connection
Pin 1	Heater
Pin 2	Grid No. 1 (Control Grid)
Pin 3	Grid No. 2 (Screen Grid)
Pin 4	Grid No. 4 (Focusing Electrode)
Pin 6	Grid No. 1 (Control Grid)
Pin 7	Cathode
Pin 8	Heater
Cap	Anode (Grid No. 3, Grid No. 5, Collector)

Interelectrode Capacitances

Grid No. 1 to all other electrodes: 6 µµF
Cathode to all other electrodes: 5 µµF
External conductive coating to anode: 800 µµF minimum, 1500 µµF maximum

The external conductive coating must be grounded to the receiver chassis to form a low-inductance, high-voltage filter capacitor in conjunction with the internal conductive coating.

Operating Modes and Electrical Characteristics

The 17CDP4 can be operated in either Grid-Drive Service (where the video signal is applied to Grid No. 1, varying its potential with respect to the cathode) or Cathode-Drive Service (where the video signal is applied to the cathode, varying its potential with respect to Grid No. 1).

Typical Operating Conditions

The following table outlines the typical operating parameters for both drive methods:

Parameter	Grid-Drive Service	Cathode-Drive Service
Anode (Ultor) Voltage	14,000 V / 16,000 V	14,000 V / 16,000 V
Grid No. 2 Voltage	300 V / 400 V	—
Grid No. 2-to-Grid No. 1 Voltage	—	300 V / 400 V
Grid No. 4 (Focus) Voltage	0 to 400 V / 0 to 400 V	—
Grid No. 4-to-Grid No. 1 Voltage	—	0 to 400 V / 0 to 400 V
Grid No. 1 Cutoff Voltage	-28 to -72 V / -36 to -94 V	—
Cathode-to-Grid No. 1 Cutoff Voltage	—	28 to 60 V / 36 to 78 V
White-Level Video Drive (Peak)	28 to 72 V / 36 to 94 V	-28 to -60 V / -36 to -78 V

Under typical operating conditions, the focusing electrode (Grid No. 4) current ranges from -25 to +25 µA, and the screen grid (Grid No. 2) current ranges from -15 to +15 µA. A centering magnet with a field strength of 0 to 8 gausses may be used for raster alignment.

Qualitative Performance Characteristics

The raster-cutoff voltage boundaries scale linearly with the applied Grid No. 2 (or Grid No. 2-to-Grid No. 1) voltage. Both anode current and highlight brightness increase exponentially as the video drive signal increases from the raster-cutoff point. For example, at a video drive of approximately 80 V from cutoff, the anode current can reach approximately 2.5 mA, producing a highlight brightness of about 700 foot-lamberts.

Maximum Ratings and Circuit Design Constraints

The 17CDP4 is rated under the Design-Center system. Operating the tube beyond these limits can impair performance or cause permanent damage.

Design-Center Maximum Ratings

Rating Parameter	Grid-Drive Service	Cathode-Drive Service
Maximum Anode Voltage	16,000 V	16,000 V
Minimum Anode Voltage	12,000 V	12,000 V
Grid No. 4 Voltage	-500 to +1000 V	—
Grid No. 4-to-Grid No. 1 Voltage	—	-500 to +1000 V
Grid No. 2 Voltage	500 V	—
Grid No. 2-to-Grid No. 1 Voltage	—	640 V
Grid No. 2-to-Cathode Voltage	—	500 V
Grid No. 1 Negative-Bias Voltage	140 V	—
Grid No. 1 Negative-Peak Voltage	200 V	—
Grid No. 1 Positive-Bias Voltage	0 V	—
Grid No. 1 Positive-Peak Voltage	2 V	—
Cathode-to-Grid No. 1 Positive-Bias Voltage	—	140 V
Cathode-to-Grid No. 1 Positive-Peak Voltage	—	200 V
Cathode-to-Grid No. 1 Negative-Bias Voltage	—	0 V
Cathode-to-Grid No. 1 Negative-Peak Voltage	—	2 V
Peak Heater-Cathode Voltage (Heater Neg. or Pos.)	180 V	180 V

Circuit Resistance Limits

Maximum Grid No. 1 Circuit Resistance: 1.5 MΩ
Minimum Grid No. 2 Circuit Resistance: 0.1 MΩ
Minimum Grid No. 4 Circuit Resistance: 0.1 MΩ

The inclusion of a minimum 0.1 MΩ protective resistor in both the Grid No. 2 and Grid No. 4 focusing electrode circuits is highly recommended to safeguard the tube against momentary internal arcs.

Safety and Shielding

The 17CDP4 is capable of operating at voltages up to an absolute maximum of 17.6 kilovolts. When operated at voltages exceeding 16 kilovolts, the tube may produce X-rays, necessitating the installation of adequate shielding in the receiver cabinet to protect users from exposure.

Technical Summary

The 17CDP4 is a compact, 110° magnetic-deflection cathode ray tube featuring low-voltage electrostatic focusing and a straight electron gun that eliminates the need for an ion trap. With an 8.4 V, 0.45 A controlled-warmup heater, it is optimized for series-string television chassis. The tube provides a 155-square-inch viewing area on an aluminized P-4 screen behind a 78% transmission neutral gray faceplate. It supports both grid-drive and cathode-drive configurations, operating typically at anode potentials of 14,000 to 16,000 V, and requires proper grounding of its external conductive coating to utilize its integrated filter capacitance.

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: -
Socket code: DUODECAL5
Base pins: -
Nominal heater voltage: 8.4 V
Nominal heater current: 450 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 screen voltage: 500 V

Source-derived section; promoted fields populated where applicable.

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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Low-Voltage Electro- Aluminized Screen I4
16
Low-Voltage Electro- Aluminized Screen I4-3/4" x 11-11/16" Screen
i1
16
i10° Magnetic Deflection for Series Heater-String Operation 12-13/16" Max. Length
type. It has a spherical Filterglass faceplate, power than is required to scan a tube with
90
type. It has a spherical Filterglass faceplate, power than is required to scan a tube with 90°
minimum projected screen area of
155
minimum projected screen area of 155 square inches. "straight'"
voltage (AC or DC)
8.4 V
voltage (AC or DC) 8.4 volts
Current. e e e e e e e
450 mA
Current. e e e e e e e 0.45 amp
in the test circuit shown in Fig
1
in the test circuit shown in Fig.1 for the voltage
zero to
6.9 V
zero to 6.9 volts.
The I7CDP4 utilizes an
450 V
The I7CDP4 utilizes an 8.4-volt, 450 mitli- Phosphorescence. white
|
105
| 10°—diagonal deflection angtle, Horizontal 105°
the
87
the 17CDP4 has a very short length——a length approx— vertical 87°
size faceplate and
8
size faceplate and 90° deflection. As a result, Greatest width . 15-5/8" ¢ 1/8"
Diagonal
1
Diagonal . . . . . . . 15-3/4" CATHODE-TO-GRID—-No.1 VOLTAGE:
Projected area . . . . « + .+«
200 V
Projected area . . . . « + .+« 4 . o0 155 sqg. in. Positive peak value. . . . . . . . . 200 max. volts
Cape « « + + . Recessed Small cavity (JETEC No.J1
140 V
Cape « « + + . Recessed Small cavity (JETEC No.J1-21) Positive bias value. « « + « « « « o 140 max. volts
BUID v v v v e e e e e e e e e e e e e
0
BUID v v v v e e e e e e e e e e e e e 132212 (1109) Negative bias value., . . . . . . . . 0 max. voltis
Base . . Small-Button Eightar
2 V
Base . . Small-Button Eightar 7-Pin Style B (JETEC No.B7-183) Negative peak value. . . . . . . . . 2 max. volts
weight (Approx.) . . . . . .« « « «
1
weight (Approx.) . . . . . .« « « « . .. 10 1bs PEAK HEATER-CATHODE VOLTAGE:
to cathode
180 V
to cathode . . . . . . . . 180 max. volts
GRID-DRIVEA SERVICE to cathode . . e e
180 V
GRID-DRIVEA SERVICE to cathode . . e e 180 max. volts
With any ultor-to-grid-¥o.l voltage (Ecgg;) between
12000
With any ultor-to-grid-¥o.l voltage (Ecgg;) between 12000
Maximum and Minimum Ratings, Design-Center Values: and
2 V
Maximum and Minimum Ratings, Design-Center Values: and 16000 volts and grid-No.2-to-grid-No.l voltage (Ecpg;/
between
640
between 225 and 640 wvolts
GRID-No.l4 VOLTAGE: ’ Grid-No.ld-to-Grid-No
1
GRID-No.l4 VOLTAGE: ’ Grid-No.ld-to-Grid-No.1
Positive value
400 V
Positive value 1000 max. volts voltage for Focusg. 0 to 400 volts
Negative value . . . .« « + « «
1 V
Negative value . . . .« « + « « . . 500 max. volts cathode-to-Grid-No,1
GRID-No
500 V
GRID-No.2 VOLTAGE., . . . . . . . . . 500 max. volts voltage (Ekgy) for
GRID-No
1
GRID-No.1 VOLTAGE: Visual Extinction
Negative peak value
200 V
Negative peak value. . . . . . . . 200 max. volts of Focused Raster
Negative bias value
140 V
Negative bias value. . . . . . . . 140 max. volts
Positive bias value
0 V
Positive bias value. . . . . . . . 0 max. volts video Drive from
Positive peak value. c
2 V
Positive peak value. c . 2 max. volts Raster Cutoff
to cathode . . . «
180
to cathode . . . « . . . 180 max. volits except videodrive is anegative voltage
Heater positive with respect Grid—-No
25
Heater positive with respect Grid—-No.4 Ccurrent. -25 to +25 pamp
to cathode
15 V
to cathode . . . - .. 180 max. volts Grid-No.2 Current. .. -15 to +15 pamp
Withany ultor voltage (Ec5k) between
16000 V
Withany ultor voltage (Ec5k) between 12000 and 16000 volts
and grid-No
2
and grid-No.2 voltage (E02k) between
200 and 500 volts Examples of Use of Design Ranges:
500 V
200 and 500 volts Examples of Use of Design Ranges:
Grid-No.dz Voltage for No.l voltage of
16000 V
Grid-No.dz Voltage for No.l voltage of 14000 16000 volts
Focus
2 V
Focus 0 to 400 volts and %rzd-No.2-to-grid-
Grid-No
400 V
Grid-No.1 Vo]tage (Ecik) 0.1 voltage of 300 400 volts
of Focused Raster. See Raster-Cutoff-Range Chart No
1
of Focused Raster. See Raster-Cutoff-Range Chart No.1 voltage
for Grid-Drive Service for Focus
0 V
for Grid-Drive Service for Focus. 0 to 400 0 tou00 volts
White-level value Focused Raster
78 V
White-level value Focused Raster 28 to 60 36 to 78 volts
Grid-No
25
Grid-No.4 Current, -25 to +25 pamp Raster Cutoff
Grid-No
78
Grid-No.2 Current. .. -15 to +15 pamp white-level value. ~28 to-60 -36to-78 voltis
Grid-No
1.5
Grid-No.1-Circuit Resistance 1.5 max. megohms
With ultor voltage of
16000 V
With ultor voltage of 14000 16000 volts
and grid-¥o
400 V
and grid-¥o.2 voltage of 300 400 volts
Grid-No
4
Grid-No. 4 Voltage for which is applied the highestdc voltage for accelerating
Focus
0 V
Focus. . 0 tou00 0to 00 volts the electrons in the beam prior to its deflection. In
of Focused Raster
17 V
of Focused Raster. -28to—-72 -36to-94 volts together within the 17CDP4, they are collectively
white-level value
1 V
white-level value. 28 to 72 36 to 9u volts signal varies the grid-No.1 potential with respect to
§ The grid-No
1
§ The grid-No.4 voltage or grid-No.d-to-grid-No.1 voltage
CATHODE-DRIVE™ SERVICE for values of ultor voltage (or ultor-to-grid-No
1
CATHODE-DRIVE™ SERVICE for values of ultor voltage (or ultor-to-grid-No.1
vo]tageg orgrid-No
1
vo]tageg orgrid-No.2 voltage (or grid-No.2-to-grid-No.1
ULTOR®-TO-GRID-No
16
ULTOR®-TO-GRID-No.1 VOLTAGE. . {igggg max. volis fall within a circle having 5/16=inch radius concentric
GRID-NO.¥
1
GRID-NO.¥4-TO-GRID-No.1 VOLTAGE:
1/2-inch deflection of the spot from the center of the
2
1/2-inch deflection of the spot from the center of the
Positive value
1000 V
Positive value 1000 max. volts tube face.
Negative value . . . e e
500 V
Negative value . . . e e 500 max. volts
GRID-No
640 V
GRID-No.2-TO0-GRID-No. 1 VOLTAGE e e 640 max. volts video signal varies the cathode potential with respect
GRID-No
1 V
GRID-No.2-T0-CATHODE VOLTAGE . . . . . 500 max. volts to grid No.1 and the other electrodes.

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
8.4 V
Nominal
Heater current
450 mA
Nominal
Anode voltage
16 V
Published CRT operating condition
Grid 2 voltage
500 V
Published CRT operating condition

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
1 code
LowVoltageElectrostatic
Deflection method
1 code
Magnetic
Deflection angle
110 deg

Other

Anode voltage maximum
16000 V
Anode voltage
14000 V
Grid No. 2 voltage maximum
500 V
Grid No. 4 focusing voltage minimum
0 V
Grid No. 4 focusing voltage maximum
400 V

Data set 04

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 (A PPR OX.)
78 %
FACEPLATE TRANSMISSION AT CENTER (A PPR OX.): 78 PERCENT
HEATER VOLTAGE
8.4 V
HEATER VOLTAGE 8.4 VOLTS
HEATER CURRENT
450 mA
HEATER CURRENT 0.45 AMP.
MAXIMUM DC ANODE VOLTAGE
16000 V
MAXIMUM DC ANODE VOLTAGE 16 OOO VOLTS
MAXIMUM DC GRID #2 VOLTAGE
500 V
MAXIMUM DC GRID #2 VOLTAGE 500 voLTs
HEATER NEGATIVE WITH RESPECT TO CATHODE IS
0 V
HEATER NEGATIVE WITH RESPECT TO CATHODE ISO VOLTS
HEATER POSITIVE WITH RE.S PECT TO CATHODE
180 V
HEATER POSITIVE WITH RE.S PECT TO CATHODE 180 voLTs
MAXIMUM GRID #1 CIRCUIT RESISTANCE
1.5 Mohm
MAXIMUM GRID #1 CIRCUIT RESISTANCE 1.5 MEGOHMS
HEATER VOLTA 6E S
4 V
HEATER VOLTA 6E S.4 VOLTS
HEATER CURRENT
45 A
HEATER CURRENT 0,45 AMP.
MAXIMUM DC GRID k4 VOLTAGE -5OO 70 +
1000 V
MAXIMUM DC GRID k4 VOLTAGE -5OO 70 +IOOO VOLTS
HEATER NEGATIVE WITH RESPECT TO CATHODE j$
0 V
HEATER NEGATIVE WITH RESPECT TO CATHODE j$O VOLTS
HEATER POSITIVE WITH RESPECT TO CATHODE 1H
0 V
HEATER POSITIVE WITH RESPECT TO CATHODE 1HO VOLTS
MAXIMUM GRID #2 TO GRID #i VOLTAGE
640 V
MAXIMUM GRID #2 TO GRID #i VOLTAGE 64O VOLTS
MAXIMUM GRID #2 TO CATHODE VOLTAGE
500 V
MAXIMUM GRID #2 TO CATHODE VOLTAGE 5OO VOLTS
UC ANODE VOLTAGE j
4000 V
UC ANODE VOLTAGE j4 OOO VOLTS
OC GRID #q VOLTAGE O TO !iC
0 V
OC GRID #q VOLTAGE O TO !iC0 VOLTS
DC GRID #1 VOLTAGE C -2F3 TO -%
2 V
DC GRID #1 VOLTAGE C -2F3 TO -%2 VOLTS
DC GRID #2 VOLTAGE
300 V
DC GRID #2 VOLTAGE 3O0 VOLTS
DC GRID #i VOL7AGE C 28 r
60 V
DC GRID #i VOL7AGE C 28 ro 60 voLTs.

Characteristic

CATHODE TO ALL OTHER ELECTRODES
5 ΜΜF
CATHODE TO ALL OTHER ELECTRODES 5 µµf
GRID #1 TO ALL OTHER ELECTRODES
6 ΜΜF
GRID #1 TO ALL OTHER ELECTRODES 6 µµf
MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE
1500 ΜΜF
MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE 1500 µµf
MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE
800 ΜΜF
MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE 800 µµf