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10SP4

Ten-inch P4 white-screen cathode-ray display tube with electrostatic focusing and magnetic deflection. The aluminized screen, roughly 50-degree deflection, and high anode-voltage capability suit bright direct-view monitor and display service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: DUODECAL6
Base pins: 6
Nominal heater: 6.3 V / 600 mA

Description

10SP4 — Monitor Kinescope

The 10SP4 is a 10-inch, direct-viewed, round glass cathode-ray tube designed primarily for monitor applications. It features electrostatic focusing, magnetic deflection, and an aluminized screen. The tube incorporates a spherical gray filterglass faceplate to enhance picture contrast and minimize ambient light reflections.

Overview

The 10SP4 is designed for high-performance monitoring service. It utilizes a spherical faceplate with a light transmission rating of approximately 76%. The screen is coated with an aluminized P4-sulfide type phosphor, which exhibits white fluorescence, white phosphorescence, and a short-to-medium persistence characteristic.

With a nominal deflection angle of 50 degrees, the 10SP4 employs magnetic deflection and electrostatic focusing. It does not require an ion trap. The tube is capable of operating in any physical orientation.

Construction and Mechanical Specifications

The 10SP4 is constructed with a round glass bulb (J84) and a spherical faceplate. The physical dimensions and mechanical installation requirements are highly specific:

Overall Length: 16-5/8 inches ± 3/8 inch
Greatest Diameter of Bulb: 10-1/2 inches ± 1/16 inch
Minimum Useful Screen Diameter: 9-1/8 inches
Picture Size: 8 inches x 6 inches (within the minimum useful screen area)
Weight: Approximately 10 lbs

Mounting and Installation Constraints

To prevent mechanical stress and ensure safe operation, several installation rules must be observed:

Base Socket: The socket for the Small-Shell Duodecal 6-Pin base (JETEC No. B6-63) must not be rigidly mounted. It must have flexible leads and be allowed to move freely. The bottom circumference of the base shell is designed to fall within a 1-7/8 inch diameter circle concentric with the bulb axis.
Tube Support: The tube support must be kept at least 2 inches away from the bulb terminal (ultor cap). A 1-1/2 inch region is designated for the tube support on the neck.
Reference Line: The reference line of the bulb is determined by the position where a JETEC No. 112 reference-line gauge (1.500 inches + 0.003 inch / -0.000 inch internal diameter, 2 inches long) rests on the bulb cone.
Terminal Alignment: The plane passing through the tube axis and Pin 6 may vary from the plane through the tube axis and the ultor terminal by an angular tolerance of ±10 degrees. The ultor terminal is located on the same side of the neck as Pin 6.

Electrical Characteristics and Basing

The 10SP4 is equipped with an indirectly heated, coated unipotential cathode. The electrical specifications and interelectrode capacitances are as follows:

Heater and Cathode Ratings

Heater Voltage: 6.3 V (AC or DC)
Heater Current: 0.6 A (nominal)
Cathode: Unipotential

Direct Interelectrode Capacitances

Grid No. 1 to all other electrodes: 6 µµF (approximate)
Cathode to all other electrodes: 5 µµF (approximate)

Basing Configuration

The tube uses a Small-Shell Duodecal 6-Pin base with a JETEC No. B6-63 designation and a 12Q basing arrangement (viewed from the bottom):

Pin / Cap	Connection
Pin 1	Heater
Pin 2	Grid No. 1 (Control Grid)
Pin 6	Grid No. 3 (Focusing Electrode)
Pin 10	Grid No. 2 (Screen Grid / Accelerator)
Pin 11	Cathode
Pin 12	Heater
Cap	Ultor (Grid No. 4, Collector / Anode)

The ultor connection is made via a Recessed Small Cavity cap (JETEC No. J1-21).

Maximum Ratings

The maximum ratings for the 10SP4 are defined under two different rating systems depending on the manufacturer's documentation. These values must be strictly observed to prevent damage to the tube.

Parameter	Design-Center Maximums	Absolute Maximums
Ultor / Anode Voltage	20,000 V	22,000 V
Grid No. 3 Voltage	3,000 V	3,300 V
Grid No. 2 Voltage	410 V	450 V
Grid No. 1 Negative Bias Value	125 V	140 V
Grid No. 1 Positive Bias Value	0 V	0 V
Grid No. 1 Positive Peak Value	2 V	2 V
Peak Heater-Cathode Voltage (Heater negative)
During warm-up (first 15 seconds)	410 V	450 V
After warm-up period	180 V	200 V
Peak Heater-Cathode Voltage (Heater positive)	180 V	200 V

Operating Conditions and Equipment Design Ranges

The 10SP4 is designed to operate over a range of ultor and grid voltages. For any ultor voltage ( $E_{c4}$ ) between 10,000 and 20,000 volts, and Grid No. 2 voltage ( $E_{c2}$ ) between 150 and 410 volts, the following design ranges apply:

Grid No. 3 Focusing Voltage: 11.7% to 15.9% of the ultor voltage ( $E_{c4}$ ) for focus with an ultor current of 100 µA.
Grid No. 1 Cutoff Voltage: 9% to 24% of the Grid No. 2 voltage ( $E_{c2}$ ) for visual extinction of an 8" x 6" raster.
Grid No. 2 Current: -15 to +15 µA.
Alignment Magnet Field Strength: 0 to 8 gausses (using an adjustable centering magnet).
Maximum Grid No. 1 Circuit Resistance: 1.5 Megohms.

Typical Operating Examples

The following examples illustrate the application of these design ranges under specific operating voltages:

Parameter	Example A	Example B	Units
Ultor / Anode Voltage	12,000	14,000	V
Grid No. 2 Voltage	200	200	V
Grid No. 3 Voltage for Focus	1400 to 1900	1640 to 2225	V
Grid No. 1 Voltage for Cutoff	-18 to -48	-18 to -48	V
Grid No. 3 Current (at $I_b = 100$ µA)	—	25 (Max)	µA

Note on Cutoff: The Grid No. 1 voltage range of -18 to -48 V is specified for the visual extinction of a focused raster. Extinction of a stationary focused spot requires the bias to be approximately 5 volts more negative (i.e., -23 to -53 V).

Operational Considerations

Voltage Limits: Brilliance and definition decrease as the ultor voltage is reduced. In general, the ultor voltage should not be operated below 10,000 volts.
Grid No. 3 Current: The current flowing into Grid No. 3 increases as the ultor voltage is decreased.

Safety and X-Ray Precautions

When operating the 10SP4 at high voltages, safety precautions regarding X-ray radiation must be taken. X-ray radiation shielding may be necessary to protect personnel from prolonged exposure at close range if the tube is operated at voltages higher than 16,000 volts or the maximum rated anode voltage, whichever is less.

Performance and Grid-Drive Characteristics

The performance of the 10SP4 is characterized by its grid-drive relationships, which describe how highlight brightness, ultor current, and Grid No. 3 current behave as a function of the video signal voltage applied relative to the raster cutoff point.

Highlight Brightness: At an ultor voltage of 12,000 V and a Grid No. 2 voltage of 200 V, the highlight brightness of an 8" x 6" raster rises smoothly with the video signal. It reaches approximately 180 foot-lamberts at a video drive of 32 volts.
Ultor Current: The ultor current increases non-linearly with video drive. At a Grid No. 2 voltage of 200 V, the current reaches approximately 380 µA at 35 V of drive. Increasing the Grid No. 2 voltage shifts the drive requirements: at a Grid No. 2 voltage of 300 V, the current reaches 600 µA at 46 V of drive, and at 400 V, it reaches 780 µA at 58 V of drive.
Grid No. 3 Current: Grid No. 3 current also rises with video drive. Under a 12,000 V ultor supply, the maximum Grid No. 3 current reaches approximately 100 µA at 30 V drive (with Grid No. 2 at 200 V), 600 µA at 46 V drive (with Grid No. 2 at 300 V), and 950 µA at 58 V drive (with Grid No. 2 at 400 V).

Socket description

Small-shell Duodecal 6-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: DUODECAL6
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 600 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: 20000 V
Max screen voltage: 410 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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Electrostatic text
Deflection Method
Magnetic text
Deflection Angle
50 deg
Approximate
Phosphor
Aluminized P4 text
Fluorescence
White text
Persistence
Short to Medium text
Light Transmittance
76 percent
Approximate
Cathode-to-All Capacitance
5 pF
Approximate
Grid1-to-All Capacitance
6 pF
Approximate

Other

Maximum Anode Voltage
22000 V
Maximum Grid3 Voltage
3300 V
Maximum Grid2 Voltage
450 V
Maximum Grid1 Negative Bias
140 V
Maximum Grid1 Positive Peak
2 V
Maximum Heater-Cathode Voltage During Warmup
450 V
Duration<=15s
Maximum Heater-Cathode Voltage After Warmup
200 V
Anode Voltage
14000 V
Grid3 Focus Voltage Minimum
1640 V
Grid3 Focus Voltage Maximum
2225 V
Grid2 Voltage
200 V
Grid1 Cutoff Voltage Minimum
-48 V
Grid1 Cutoff Voltage Maximum
-18 V
Maximum Grid3 Current
25 uA
AnodeCurrent=100uA
Maximum Grid1 Circuit Resistance
1.5 Mohm

Data set 02

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Voltage
6.3 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Current
0.6
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Grid No.1 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.)
76
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Deflection A°qle (Approx.)
50
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Minimum Useful Screen Diameter — published value 1
9
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Minimum Useful Screen Diameter — published value 2
1
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Minimum Useful Screen Diameter — published value 3
8
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Picture Size (Within minimum useful screen area) — published value 1
8
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
Picture Size (Within minimum useful screen area) — published value 2
6
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
and grid-No.2 voltage (Ecz) between 15o and qio voCts
15 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 1
100 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 2
11.7 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 3
15.9 V
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.
andgrid-No.2 voltage of
20 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 1
1400 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 2
1900 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 3
1640 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
current of 100 µa — published value 4
2225 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
In general, the ultor voltage should not be less than 10,000 volts — published value 1
10 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
In general, the ultor voltage should not be less than 10,000 volts — published value 2
0 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
73~fi — published value 1
73
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
73~fi — published value 2
3
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
73~fi — published value 3
9
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR (GRID-N~ 4-AND
4
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
'GRID-N°3 VOLTS ADJUSTED TO GIVE FOCUS
3 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-N+:3 VOLTS
3 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
ULTOR (GRID-N' 4 AND
4
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

Other

ULTOR VOLTAGE
20000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-No.3 VOLTAGE
3000 V
Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.
GRID-No.2 VOLTAGE
410 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.