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16QP4

Direct-view cathode-ray picture tube documented by manufacturer data for type 16QP4; available extracted technical detail is limited, so the description remains conservative.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12O
Socket code: DUODECAL5
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

16QP4 — Direct-View Cathode Ray Tube

The 16QP4 is a rectangular glass, direct-view picture tube designed primarily for television receiver applications. It features magnetic focus and deflection, a unipotential cathode, a grey filter faceplate, and requires an external double field ion trap magnet for proper operation.

Mechanical Specifications and Physical Dimensions

The 16QP4 is constructed with a rectangular glass bulb. Its physical dimensions and screen characteristics are as follows:

Overall Length: 19 1/8 inches
Greatest Bulb Dimensions:
- Diagonal: 16 1/8 inches
- Width: 14 3/4 inches
- Height: 11 1/2 inches
Minimum Useful Screen Dimensions:
- Diagonal: 15 inches
- Width: 13 19/32 inches
- Height: 10 3/16 inches
Useful Screen Area (Raster Size): 13 1/2 inches width by 10 1/8 inches height
Neck Diameter: 1 7/16 ± 1/16 inches
Bulb Contact: Recessed small cavity cap (J1-21)
Base: Small shell duodecal 5-pin (B5-57)
Basing Designation: 12D

The tube's neck includes a designated space that must be kept clear for the installation of the external double field ion trap magnet. The anode terminal is located on the side of the bulb, positioned 3 5/8 ± 3/8 inches from the reference line.

Electrical Connections and Interelectrode Capacitances

The 16QP4 utilizes the 12D basing configuration, which provides the following pin connections viewed from the bottom of the base:

Pin Number	Connection
Pin 1	Heater
Pin 2	Grid No. 1
Pin 10	Grid No. 2
Pin 11	Cathode
Pin 12	Heater
Cap	Anode

The direct interelectrode capacitances of the tube are approximately:

Cathode to all other electrodes: 5 µµF
Grid No. 1 to all other electrodes: 7 µµF

Optical Characteristics

The faceplate of the 16QP4 is made of grey filter glass to improve picture contrast under ambient light. The optical properties of the screen are:

Phosphor Number: No. 4
Fluorescent Color: White
Phosphorescent Color: White
Persistence: Medium

Ratings and Operating Limits

The following limits are established on the design center system:

Heater Ratings

Heater Voltage: 6.3 Volts
Heater Current: 0.6 Ampere
Calculated Heater Power: 3.78 Watts (derived from 6.3 V × 0.6 A)

Maximum Ratings

Maximum DC Anode Voltage: 16,000 Volts
Maximum DC Grid No. 2 Voltage: 410 Volts
Maximum Grid No. 1 Voltage:
- DC Negative-Bias Value: 125 Volts
- DC Positive-Bias Value: 0 Volts
- Positive-Peak Value: 2 Volts
Maximum DC Peak Heater-Cathode Voltage:
- Heater negative with respect to cathode:
  - During warm-up period (not to exceed 15 seconds): 410 Volts
  - After equipment warm-up period: 125 Volts
- Heater positive with respect to cathode: 125 Volts
Maximum Grid No. 1 Circuit Resistance: 1.5 Megohms

Typical Operating Conditions

Under typical operating conditions, the 16QP4 is configured with the following parameters:

DC Anode Voltage: 14,000 Volts
DC Grid No. 2 Voltage: 250 Volts
DC Grid No. 1 Voltage: -27 to -63 Volts (for visual extinction of the undeflected focused spot)
DC Focusing Coil Current: Approximately 150 mA
DC Ion Trap Current: Approximately 120 mA (using standard coil #108)

The deflection angles for the scanning raster are approximately:

Horizontal Deflection Angle: 54.5 degrees
Vertical Deflection Angle: 50.8 degrees
Diagonal Deflection Angle: 70 degrees

Technical Summary

The 16QP4 is a 16-inch class rectangular glass cathode ray tube designed for television display applications. It operates with a nominal 6.3 V, 0.6 A heater and utilizes magnetic focus and deflection. With a typical anode operating voltage of 14,000 V and a maximum rating of 16,000 V, the tube provides a white display using a No. 4 medium-persistence phosphor. Its design incorporates a grey filter faceplate to enhance contrast, a duodecal 5-pin base, and requires an external double field ion trap magnet.

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: 12O
Socket code: DUODECAL5
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12O - 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: 16000 V
Max screen voltage: 41 V

CRT-specific anode/focus/deflection ratings retained as parameters rather than mapped to ordinary plate/screen fields.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Anode Voltage
16000 V
Typical Anode Voltage
14000 V
Maximum Grid2 Voltage
410 V
Typical Grid2 Voltage
250 V

Characteristic

DeflectionAngleApproximate
70 degree
FocusingMethod
Magnetic
DeflectingMethod
Magnetic
PhosphorNumber
4
FluorescentColor
White
Persistence
Medium

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

MAGNETIC FOCUS 8 DEFLECTION — value 1
1 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAGNETIC FOCUS 8 DEFLECTION — value 2
13 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAGNETIC FOCUS 8 DEFLECTION — value 3
1 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
OC ANODE VOLTAGE
14000 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #2 VOLTAGE — value 2
2 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #i VOLTAGE A — value 1
27 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #i VOLTAGE A — value 2
63 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC FOCUSING COIL CURRENT (APPROX.)
150 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.

Other

MAXIMUM DC ANODE VOLTAGE
16000 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM DC GRID #2 VOLTAGE — value 2
41 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM GRID #1 VOLTAGE
1 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM GRID #i CIRCUIT RESISTANCE — value 1
1 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM GRID #i CIRCUIT RESISTANCE — value 2
5 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.