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17QP4B

Magnetically focused and deflected P4 picture-display tube with approximately 70-degree deflection, typical 14 kV operation, a 20 kV maximum anode rating, and an explicit high-voltage X-ray shielding warning.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

17QP4B — Rectangular Glass Picture Tube

The 17QP4B is a rectangular glass cathode-ray picture tube designed primarily for monochrome television receiver applications. It features a 70-degree magnetic deflection system, magnetic focusing, and an aluminized screen. The tube is designed with an electron gun that does not require an external ion-trap magnet, simplifying receiver setup and adjustment.

Physical and Screen Construction

The 17QP4B is built with a rectangular glass envelope and a specialized filterglass faceplate. This faceplate has a light transmission rating of approximately 74%, which enhances picture contrast by reducing the impact of ambient room light. The screen utilizes a P4-Sulfide Type phosphor and is aluminized to maximize light output and prevent ion burn.

Physical Dimensions and Weight

Overall Length: 19-3/16 inches (± 3/8 inch)
Neck Length: 7-1/2 inches (± 3/16 inch)
Projected Screen Area: 149 square inches
Weight: Approximately 19 lbs

The tube's envelope includes an external conductive coating of the Regular-Band type. This coating has a designated grounding contact area located near the reference line. The capacitance formed between the external conductive coating and the internal anode serves as a high-voltage filter capacitor for the receiver's power supply.

Base, Cap, and Electrical Connections

The 17QP4B utilizes a Small-Shell Duodecal 5-Pin base (JEDEC Group 4, No. B5-57) with a 12N basing designation when viewed from the bottom. The high-voltage anode connection is made via a side-bulb Recessed Small Cavity cap (JEDEC No. J1-21).

The pinout configuration is as follows:

Pin 1: Heater
Pin 2: Grid No. 1 (Control Grid)
Pin 10: Grid No. 2 (Screen Grid)
Pin 11: Cathode
Pin 12: Heater
Cap: Anode (Grid No. 3, Screen, Collector)
C: External Conductive Coating (Grounding contact)

Heater and Interelectrode Capacitances

The heater is designed to operate at a nominal voltage of 6.3 volts. It has controlled warm-up characteristics, making it suitable for series-connected heater strings as well as parallel configurations.

Parameter	Value
Nominal Heater Voltage	6.3 V
Heater Current	600 ± 60 mA
Average Heater Warm-Up Time	11 seconds

Interelectrode Capacitances

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

Design-Maximum Ratings

The ratings below are specified under the Design-Maximum Rating System. Operating the tube beyond these limits may impair its performance or cause permanent damage. All voltages are positive with respect to the cathode unless otherwise specified.

Anode Voltage: 20,000 max. volts
Grid-No. 2 Voltage: 550 max. volts
Grid-No. 1 Voltage:
- Negative peak value: 220 max. volts
- Negative bias value: 155 max. volts
- Positive bias value: 0 max. volts
- Positive peak value: 2 max. volts
Heater Voltage: 5.7 min. volts to 6.9 max. volts
Peak Heater-Cathode Voltage:
- Heater negative with respect to cathode:
  - During equipment warm-up period (first 15 seconds or less): 450 max. volts
  - After equipment warm-up period: 200 max. volts
- Heater positive with respect to cathode:
  - Combined AC and DC voltage: 200 max. volts
  - DC component: 100 max. volts

Typical Operating Conditions (Grid-Drive Service)

In typical grid-drive service, the electrodes are operated at the following potentials (with voltages positive with respect to the cathode):

Anode Voltage: 14,000 volts
Grid-No. 2 Voltage: 300 volts
Grid-No. 1 Voltage for visual extinction of focused raster: -28 to -72 volts

Maximum Circuit Values

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

Technical Summary

The 17QP4B is a 70-degree magnetic deflection, magnetically focused monochrome picture tube featuring a 149-square-inch aluminized screen with P4-Sulfide phosphor. It is housed in a rectangular glass envelope with a 74% transmission filterglass faceplate and uses a Small-Shell Duodecal 5-Pin base. With a nominal 6.3 V, 600 mA heater and an average warm-up time of 11 seconds, the tube operates typically at an anode voltage of 14,000 V, while supporting design-maximum anode voltages up to 20,000 V.

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: 20000 V
Max screen voltage: 550 V

Magnetic-focus P4 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
Heater warm-up time
11 s
Maximum anode/ultor voltage
20000 V
Typical anode/ultor voltage
14000 V
PictureTubeService
Maximum grid No.2 voltage
550 V
Typical grid No.2 voltage
300 V
PictureTubeService
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
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
Magnetic
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
External conductive coating to anode capacitance maximum
1500 pF
Approximate