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17LP4B

Seventeen-inch monochrome P4 picture tube with low-voltage electrostatic focus and approximately 70-degree magnetic deflection. Its high-voltage direct-view construction is intended for television receiver display and includes an X-ray radiation warning.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

17LP4B Television Picture Tube

The 17LP4B is a rectangular glass picture tube designed for television display applications. It features an aluminized screen, low-voltage electrostatic focusing, and 70-degree magnetic deflection. The electron gun design is self-contained and requires no ion-trap magnet.

Physical and Mechanical Design

The 17LP4B is constructed with a cylindrical filterglass faceplate that provides approximately 66% light transmission. The screen utilizes a P4-sulfide type aluminized phosphor to optimize brightness and contrast.

The physical dimensions and mechanical specifications of the tube include:

Weight: Approximately 19 lbs
Overall Length: 19-3/16" ± 3/8"
Neck Length: 7-1/2" ± 3/16"
Projected Screen Area: 149 sq. in.
External Conductive Coating: Regular-Band type, with the grounding contact located near the reference line.
Anode Cap: Recessed Small Cavity (JEDEC No. J1-21)
Base: Small-Shell Duodecal 6-Pin (JEDEC Group 4, No. B6-63) utilizing the 12L basing designation.

Heater Ratings and Electrical Connections

The 17LP4B is equipped with an indirectly heated cathode. The heater is designed to operate under the following specifications:

Parameter	Value
Nominal Heater Voltage	6.3 V
Heater Current	600 ± 30 mA
Design-Maximum Heater Voltage Range	5.7 to 6.9 V

Pinout Configuration (Basing 12L)

The electrical connections are accessed via the 6-pin Small-Shell Duodecal base, viewed from the bottom:

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

Interelectrode Capacitances

The direct interelectrode capacitances of the tube are as follows:

Cathode to all other electrodes: 5 pF
Grid No. 1 to all other electrodes: 6 pF
External conductive coating to anode: 750 pF minimum, 1500 pF maximum

Design-Maximum Ratings

The following design-maximum ratings represent the absolute limits within which the 17LP4B must be operated. All voltages are positive with respect to the cathode unless otherwise specified.

Anode Voltage: 17500 max V
Grid No. 4 (Focusing) Voltage: -550 to +1100 max V
Grid No. 2 Voltage: 550 max V
Grid No. 1 Voltage:
- Negative peak value: 220 max V
- Negative bias value: 155 max V
- Positive bias value: 0 max V
- Positive peak value: 2 max V
Peak Heater-Cathode Voltage:
- Heater negative to cathode: 450 max V during warm-up (less than or equal to 15 seconds); 200 max V after warm-up.
- Heater positive to cathode: 200 max V (combined AC/DC); 100 max V (DC component).

Typical Operating Conditions (Grid-Drive Service)

Under typical grid-drive operating conditions, the electrode potentials are configured as follows:

Anode Voltage: 14000 V
Grid No. 4 (Focusing) Voltage: -56 to +310 V
Grid No. 2 Voltage: 300 V
Grid No. 1 Voltage (for visual extinction of focused raster): -28 to -72 V

Maximum Circuit Values

To ensure stable operation, the maximum resistance in the Grid No. 1 circuit must be restricted:

Grid-No. 1-Circuit Resistance: 1.5 max megohms

Technical Summary

The 17LP4B is a 70-degree magnetic deflection, low-voltage electrostatic focus rectangular picture tube. Weighing approximately 19 lbs and featuring a 149 sq. in. projected screen area, it operates with a 6.3 V, 600 mA heater. The tube is characterized by its aluminized P4-sulfide screen, a maximum anode rating of 17500 V, and a design that eliminates the need for an external ion-trap magnet.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
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: 17500 V
Max screen voltage: 550 V

P4 television picture tube.

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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Heater current
600 mA
Maximum anode/ultor voltage
17500 V
Typical anode/ultor voltage
14000 V
PictureTubeService
Maximum grid No.2 voltage
550 V
Typical grid No.2 voltage
300 V
PictureTubeService
Focus-voltage range minimum
-56 V
OptimumFocus
Focus-voltage range maximum
310 V
OptimumFocus
Visual-extinction voltage range minimum
-72 V
FocusedRasterExtinction
Visual-extinction voltage range maximum
-28 V
FocusedRasterExtinction
Maximum grid No.1 circuit resistance
1.5 megohm
X-ray shielding warning
Present
HighAnodeVoltage
Maximum negative grid No.1 peak voltage
220 V
Maximum negative grid No.1 bias magnitude
155 V
Maximum positive grid No.1 peak voltage
2 V
Peak heater-cathode voltage during warm-up
450 V
HeaterNegative;Warmup<=15s
Peak heater-cathode voltage after warm-up
200 V
HeaterNegative
Peak heater-cathode voltage heater positive
200 V
HeaterPositive

Construction

Focusing method
LowVoltageElectrostatic
Deflection method
Magnetic
Phosphor
P4
Screen type
White
P4

Characteristic

Deflection angle
70 deg
Approximate

Capacitance

Cathode to all other electrodes capacitance
5 pF
Approximate