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17AVP4

P4 cathode-ray display tube documented for high-voltage direct-view operation, using magnetic deflection and manufacturer-specified beam focusing and control arrangements appropriate to type 17AVP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12L
Socket code: DUODECAL5
Base pins: 6
Nominal heater: 6.3 V / 600 mA

Description

17AVP4 — Direct-View Cathode Ray Picture Tube

The 17AVP4 and 17AVP4A are direct-view rectangular glass cathode ray picture tubes designed for television receiver applications. These tubes feature a unipotential cathode, low-voltage electrostatic focusing, magnetic deflection, a filterglass faceplate, and an external single-field ion trap. The 17AVP4 and 17AVP4A are identical in design and electrical characteristics, with the sole exception that the 17AVP4A features an aluminized screen to enhance brightness and contrast.

Mechanical Specifications and Physical Dimensions

The 17AVP4 utilizes a rectangular glass bulb construction with a filterglass faceplate. The physical dimensions and mechanical mounting requirements are:

Overall Length: 15 5/8 inches ± 3/8 inch
Bulb Diagonal: 16 5/8 inches ± 1/8 inch
Bulb Width: 15 3/8 inches ± 1/8 inch
Bulb Height: 12 9/32 inches ± 1/8 inch
Minimum Useful Screen Dimensions: 14 1/4 inches wide by 10 3/4 inches high
Raster Size: Approximately 10 3/8 inches to 10 3/4 inches high by 14 1/4 inches wide
Bulb Contact: Recessed small cavity cap (J1-21)
Base: Small shell duodecal 6-pin (B6-63)
Basing Configuration: 12L

To prevent mechanical stress on the glass envelope and base, the socket should not be rigidly mounted. It must have flexible leads and be allowed to move freely.

Pin Connections

The 12L bottom-view pinout configuration provides the following connections:

Pin 1: Heater
Pin 2: Grid #1 (Control Grid)
Pin 6: Grid #4 (Focusing Electrode)
Pin 10: Grid #2 (Screen Grid)
Pin 11: Cathode
Pin 12: Heater
Anode Cap: Grid #3, Grid #5, and Collector

Electrical and Optical Characteristics

The tube operates with a nominal heater supply and utilizes magnetic deflection alongside electrostatic focusing.

Deflection and Capacitances

The deflection angles are approximately:

Horizontal: 85°
Vertical: 68°
Diagonal: 90°

Direct interelectrode capacitances are approximately:

Cathode to all other electrodes: 5 µµF
Grid #1 to all other electrodes: 6 µµF
External conductive coating to anode: 750 µµF (minimum) to 1500 µµF (maximum)

Optical Data

The screen utilizes a P-4 phosphor, which provides:

Fluorescent Color: White
Phosphorescent Color: White
Persistence: Short

Maximum Ratings

The following limits are established under the Design Center system:

Heater Voltage: 6.3 V
Heater Current: 0.6 A
Maximum DC Collector, Grid #3, Grid #5 Voltage: 16,000 V
Maximum DC Grid #4 Voltage: -500 V to +1000 V (The focus electrode may be modulated to improve overall focus)
Maximum DC Grid #2 Voltage: 500 V
Maximum Grid #1 Voltage:
- DC Negative-bias value: 125 V
- DC Positive-bias value: 0 V
- Positive-peak value: 2 V
Maximum DC Peak Heater-Cathode Voltage:
- Heater negative with respect to cathode during warm-up (≤ 15 seconds): 410 V
- Heater negative with respect to cathode after warm-up: 180 V
- Heater positive with respect to cathode: 180 V
Maximum Grid #1 Circuit Resistance: 1.5 MΩ

Typical Operating Conditions

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

DC Collector, Grid #3, Grid #5 Voltage: 12,000 V
DC Grid #4 Voltage (Focusing Electrode): -48 V to +264 V (with combined Grid #1 and video-signal voltage adjusted to give a collector current of 100 µA on a 10 3/4" x 14 1/4" picture area)
DC Grid #2 Voltage: 300 V
DC Grid #1 Voltage: -33 V to -77 V (for visual extinction of the undeflected focused spot)
DC Grid #2 Current: -15 µA to +15 µA
DC Focusing Electrode Current: -25 µA to +25 µA
Ion Trap Current: 30 mA (using standard coil #117)

Technical Summary

The 17AVP4 and 17AVP4A are 90-degree magnetic deflection, low-voltage electrostatic focus cathode ray tubes designed for television display service. Operating with a standard 6.3 V, 0.6 A heater, they provide a rectangular viewing area of approximately 10 3/4" by 14 1/4" using a P-4 white phosphor screen. The 17AVP4A variant incorporates an aluminized screen for improved brightness. These tubes require an external single-field ion trap and a non-rigidly mounted socket to ensure reliable operation within their design limits.

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: 12L
Socket code: DUODECAL5
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12L - 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: 17600 V
Max screen voltage: 550 V

CRT-specific anode, focus, deflection and optical data retained as parameters rather than forced into 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater Voltage
6.3 V
Heater Current
600 mA
Cathode To All Other Electrodes Capacitance
5 pF
Approximate

Other

Maximum Anode Voltage
17600 V
Maximum Grid2 Voltage
550 V
Typical Anode Voltage
14000 V

Data set 02

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
12000 V
Maximum Grid2 Voltage
500 V
Typical Grid2 Voltage
300 V

Characteristic

FocusingMethod
LowVoltageElectrostatic
DeflectingMethod
Magnetic
DiagonalDeflectionAngleApproximate
90 degree
PhosphorNumber
4
FluorescentColor
White
Persistence
Medium

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum DC grid 2 voltage
500 V
Maximum DC grid 4 voltage
-500 to 1000 V
Maximum grid 1 negative-bias voltage
125 V
NegativeBias
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
2 V
PositivePeak
Peak heater-cathode voltage
410 V
HeaterNegativeWarmup
Peak heater-cathode voltage
180 V
HeaterNegativeAfterWarmup
Peak heater-cathode voltage
180 V
HeaterPositive
DC anode voltage
12000 V
TypicalOperation
DC grid 4 voltage
-48 to 264 V
TypicalOperation
DC grid 2 voltage
300 V
TypicalOperation
DC grid 1 voltage
-33 to -77 V
TypicalOperation
Ion trap current
30 mA
Approximate

Characteristic

Horizontal deflection angle
85 degrees
Approximate
Vertical deflection angle
68 degrees
Approximate
Diagonal deflection angle
90 degrees
Approximate

Capacitance

Cathode to all other electrodes capacitance
5 pF
Approximate
Grid 1 to all other electrodes capacitance
6 pF
Approximate
External conductive coating to anode capacitance
1500 pF
Maximum
External conductive coating to anode capacitance
750 pF
Minimum