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17DXP4

Seventeen-inch direct-view monochrome television CRT with tri-potential electrostatic focus, magnetic deflection, and an aluminized P4 white screen. Its high-voltage system and broad deflection geometry provide a bright receiver picture and require X-ray precautions.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: NEOEIGHTAR7
Base pins: 7
Nominal heater: 6.3 V / 450 mA

Description

17DXP4 — Tri-Potential Electrostatic Focus Television Picture Tube

Overview

The 17DXP4 is a 17-inch direct-viewed, rectangular glass television picture tube. It features a short neck, a spherical gray filterglass faceplate, and an aluminized screen utilizing P4-Sulfide phosphor. The tube employs a tri-potential low-voltage electrostatic focusing method and 110-degree magnetic deflection. Its electron gun is designed to operate without requiring an external ion-trap magnet. Additionally, the tube incorporates an external conductive coating and a controlled warm-up time heater for unipotential cathode operation.

Mechanical Specifications and Physical Dimensions

The 17DXP4 is housed in a J132-1/2 A/B bulb and has a spherical faceplate with approximately 77% light transmission. The minimum useful screen dimensions provide a projected area of 155 square inches, with a minimum height of 11-11/16", a minimum width of 14-3/4", and a minimum diagonal of 15-3/4".

Parameter	Value
Overall Length	10-11/16" ± 1/4"
Greatest Width	15-5/8" ± 1/8"
Greatest Height	12-3/4" ± 1/8"
Diagonal	16-9/16" ± 1/8"
Neck Length	3-9/16" ± 1/8"
Weight	Approx. 10 lbs
Operating Position	Any

The tube uses a Small-Button Neoeightar 7-Pin base (JEDEC No. B7-208) and a Recessed Small Cavity Cap (JEDEC No. J1-21) for the anode connection. The socket should be a non-rigid mounting type with flexible leads, such as Ucinite Part No. 115446 or its equivalent.

Heater and Interelectrode Capacitances

The unipotential cathode is heated by a 6.3 V heater with a controlled warm-up time.

Heater Parameter	Value
Heater Voltage (AC or DC)	6.3 V
Heater Current	0.45 A ± 5% (450 mA)
Average Warm-up Time	11 seconds

The heater warm-up time is defined as the time required to reach 80% of the rated heater voltage when tested in series with a resistance equal to three times the rated heater voltage divided by the rated heater current, applying four times the rated heater voltage.

Direct interelectrode capacitances are approximately:

Grid No. 1 to all other electrodes: 6 µµF
Cathode to all other electrodes: 5 µµF
External conductive coating to anode (ultor): 1000 pF (min) to 1500 pF (max)

Basing and Pinout

The 17DXP4 utilizes the 8JR basing arrangement. Base Pin No. 4 aligns with the horizontal centerline within 30 degrees and is located on the same side as the anode contact.

Pin Number	Connection
Pin 1	Heater
Pin 2	Grid No. 1
Pin 3	Grid No. 2
Pin 4	Grid No. 3 (Focusing Electrode)
Pin 6	Internal Connection (Do Not Use)
Pin 7	Cathode
Pin 8	Heater
Cap	Anode / Ultor (Grid No. 4, Collector)
External Coating	Must be grounded

Operating Ratings

The maximum and minimum ratings for the 17DXP4 are published under both Design-Center and Design-Maximum rating systems for Grid-Drive service.

Parameter	Design-Center Rating	Design-Maximum Rating
Anode (Ultor) Voltage	12,000 V min / 16,000 V max	17,600 V max (11,000 V absolute min)
Grid No. 3 (Focusing) Voltage	650 V max	700 V max
Grid No. 2 Voltage	300 V min / 550 V max	600 V max
Grid No. 1 Negative-Peak Voltage	200 V max	220 V max
Grid No. 1 Negative-Bias Voltage	140 V max	154 V max
Grid No. 1 Positive-Bias Voltage	0 V max	0 V max
Grid No. 1 Positive-Peak Voltage	2 V max	2 V max
Peak Heater-Cathode Voltage (Heater negative to cathode, warm-up ≤ 15s)	410 V max	450 V max
Peak Heater-Cathode Voltage (Heater negative to cathode, after warm-up)	180 V max	200 V max
Peak Heater-Cathode Voltage (Heater positive to cathode)	180 V max	200 V max

For Cathode-Drive service, the ratings are specified relative to Grid No. 1:

Ultor-to-Grid-No. 1 Voltage: 12,000 V min to 16,000 V max (Design-Center)
Grid-No. 3-to-Grid-No. 1 Voltage: 650 V max (Design-Center)
Grid-No. 2-to-Grid-No. 1 Voltage: 690 V max (Design-Center)
Grid-No. 2-to-Cathode Voltage: 300 V min to 550 V max (Design-Center)
Cathode-to-Grid-No. 1 Voltage:
- Positive-peak: 200 V max
- Positive-bias: 140 V max
- Negative-bias: 0 V max
- Negative-peak: 2 V max

Typical Operating Conditions and Service Examples

The 17DXP4 can be operated in either Grid-Drive or Cathode-Drive configurations.

Grid-Drive Service Examples

Anode Voltage: 14,000 V (Typical) or 16,000 V (Example)
Grid-No. 3 Voltage for Focus: 0 to 400 V
Grid-No. 2 Voltage: 400 V to 500 V (A minimum of 400 V is recommended for improved brightness and resolution)
Grid-No. 1 Voltage for Visual Extinction:
- At Grid-No. 2 = 400 V: -34 V to -63 V
- At Grid-No. 2 = 500 V: -43 V to -78 V
- Note: Extinction of a stationary focused spot requires approximately 5 V more negative bias.
Grid-No. 1 Video Drive (White-level, peak positive):
- At Grid-No. 2 = 400 V: 34 V to 63 V
- At Grid-No. 2 = 500 V: 43 V to 78 V
Maximum Grid-No. 1 Circuit Resistance: 1.5 Megohms

Cathode-Drive Service Examples (at 16,000 V Ultor-to-Grid-No. 1)

Grid-No. 2-to-Grid-No. 1 Voltage: 400 V or 500 V
Grid-No. 3-to-Grid-No. 1 Voltage for Focus: 0 to 400 V
Cathode-to-Grid-No. 1 Voltage for Visual Extinction:
- At Grid-No. 2-to-Grid-No. 1 = 400 V: 34 V to 56 V
- At Grid-No. 2-to-Grid-No. 1 = 500 V: 41 V to 69 V
Cathode-to-Grid-No. 1 Video Drive (White-level, peak negative):
- At Grid-No. 2-to-Grid-No. 1 = 400 V: -34 V to -56 V
- At Grid-No. 2-to-Grid-No. 1 = 500 V: -41 V to -69 V
Maximum Grid-No. 1 Circuit Resistance: 1.5 Megohms

Focusing and Operating Considerations

The tri-potential electrostatic focusing system is highly sensitive. The optimum focus voltage varies dynamically based on operating parameters:

It increases directly with anode voltage at a rate of approximately 46 V per 1000 V change.
It decreases inversely with Grid-No. 2 voltage at a rate of approximately 60 V per 100 V change.
It decreases inversely with anode current at a rate of approximately 60 V per 100 µA change.

Because of this narrow depth of focus, a potentiometer or a 4-tap switch is required in the focusing circuit. The equipment design range for Grid-No. 3 current is -25 to +25 µA, and for Grid-No. 2 current is -15 to +15 µA. If a centering magnet is used, its field strength should be adjustable from 0 to 12 gausses.

Safety and Shielding

The external conductive coating of the 17DXP4 must be reliably grounded. For safety, a shatter-proof glass cover should be installed over the tube face to protect against potential implosion and to provide X-ray shielding. X-ray radiation shielding may be necessary if the tube is operated above 16,000 V or the maximum rated anode voltage, to protect against prolonged exposure at close range.

Socket description

Small-button Neoeightar 7-contact CRT base family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: NEOEIGHTAR7
Base pins: 7
Nominal heater voltage: 6.3 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 plate voltage: 36000 V
Max screen voltage: 550 V

CRT-specific ratings, operating conditions, capacitances, focus/deflection, cutoff, optical, and screen data are retained in section parameters.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Plate Voltage
17600 V
Anode Voltage
14000 V

Characteristic

Phosphor
P4
Aluminized

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
Tri-potential electrostatic
Deflection method
Magnetic
Horizontal deflection angle
81 deg
Diagonal deflection angle
92 deg
Vertical deflection angle
67 deg
Fluorescence
White
Persistence
Short to medium
Heater voltage
6.3 V
Heater current
450 mA

Construction

Phosphor
Aluminized P4

Other

Maximum anode voltage
17600 V
Typical anode voltage
14000 V
Typical grid2 voltage
500 V
Cutoff voltage range
-43 to -78 V
Grid1 circuit resistance maximum
1.5 Mohm

Capacitance

Grid1-to-all capacitance
6 pF
External conductive coating to anode capacitance maximum
1500 pF

Application

Application
Monochrome television picture display

Data set 03

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Voltage (AC or DC)
6.3 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
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.
Current at 6.3 volts — published value 2
0.45 V
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
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Light transmission (Approx )
77
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus§ — published value 1
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus§ — published value 2
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.3 Current — published value 1
-25
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.3 Current — published value 2
25
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.2 Current — published value 1
-15
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.2 Current — published value 2
15
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
With ultor voltage of
36000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus — published value 1
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus — published value 2
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus — published value 3
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focus — published value 4
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
of focused raster — published value 1
34 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
of focused raster — published value 2
63 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
of focused raster — published value 3
43 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
of focused raster — published value 4
-78 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
With any ultor-to-grid-No.3 voltage (Ec4g 1 1 between — published value 1
1 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
With any ultor-to-grid-No.3 voltage (Ec4g 1 1 between — published value 2
1 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
32000 and 36000 volts and grid-No.z-to-grid — published value 1
32000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
32000 and 36000 volts and grid-No.z-to-grid — published value 2
36000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
No.3 voltage (E~ZgI) between qoa and 6qo volts
6 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Voltage for focus§ — published value 1
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Voltage for focus§ — published value 2
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
No.1 voltage of — published value 1
16000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
No.1 voltage of — published value 2
16000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
for focus — published value 1
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
for focus — published value 2
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
for focus — published value 3
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
for focus — published value 4
400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focused raster — published value 1
34 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focused raster — published value 2
56 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focused raster — published value 3
41 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
focused raster — published value 4
69 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
a{nifus into r— or into r—to—gritl—No.1 voltage is 11,000 volts, below — published value 1
11 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
a{nifus into r— or into r—to—gritl—No.1 voltage is 11,000 volts, below — published value 2
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
into r— or into r—to—grid—x0.1 voltage is never less than 11,000 volts — published value 1
11 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
into r— or into r—to—grid—x0.1 voltage is never less than 11,000 volts — published value 2
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
u6 volts for each 1000—volt change in ultor voltage; inversely with
1000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
grid—No.2 voltage at the rate of about 60 volts }or each 100—volt — published value 1
60 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
grid—No.2 voltage at the rate of about 60 volts }or each 100—volt — published value 2
100 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
rate of about 60 volts for each 100—microampere change in ultor current — published value 1
60 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
rate of about 60 volts for each 100—microampere change in ultor current — published value 2
100 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
o Dtained If the focusing voltage is ithin 75 olts of the value
75 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
to within 75 volts OP the optimum val ue tluring line—voltage fluctuations
75 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
unde Plected' focu sed 'spot well fall within a circle having a 5/16—inch — published value 1
5
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
unde Plected' focu sed 'spot well fall within a circle having a 5/16—inch — published value 2
16
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR VOLTS=12000 7016000 — published value 1
12000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR VOLTS=12000 7016000 — published value 2
7016000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-N'2 VOLTS
2 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR-TO-GRID-Nsl VOLTS=12000 TO 16000 — published value 1
12000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR-TO-GRID-Nsl VOLTS=12000 TO 16000 — published value 2
16000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

Other

GRID-No.3 (FOCUSING) VOLTAGE
650 V
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.
Heater positive with respect to cathode
180 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.l-Circuit Resistance — published value 1
1 mA
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid-No.l-Circuit Resistance — published value 2
5 mA
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
VOLTAGE
650 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-No.2-TO-GRID-No.1 VOLTAGE
690 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-No.2-TD-CATHODE VOLTAGE
550 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.