Specialized - Cathode Ray ·CathodeRay
P4 cathode-ray picture tube documented by Tung-Sol for direct-view television service; available extracted source detail is limited.
The 16HP4A is a direct-view, round glass cathode ray picture tube designed primarily for television receiver applications. It features magnetic focus and magnetic deflection with a nominal deflection angle of approximately 60 degrees. The tube incorporates a unipotential cathode, an external conductive coating, and requires an external double field ion trap magnet.
The 16HP4A is identical to the 16HP4 except for its faceplate construction: the 16HP4A utilizes a grey filter faceplate to improve picture contrast under ambient light conditions, providing a faceplate light transmission of approximately 70 percent at the center. The tube provides a standard 10 1/4" by 14 1/2" raster size with a minimum useful screen diameter of 14 1/2 inches.
The 16HP4A is constructed with a round glass bulb and a small shell duodecal 5-pin base (designation B5-57), utilizing the 12N basing arrangement.
The electrical connections are made through the 5-pin duodecal base and a recessed small cavity cap (J1-21) which serves as the anode terminal. The J1-21 anode contact is aligned with pin position #3 within a tolerance of ±10 degrees.
The pinout configuration (viewed from the bottom of the base) is as follows:
A dedicated space of 4 5/8 ± 1/16 inches along the neck, measured from the reference line toward the base, must be kept clear to accommodate the external double field ion trap magnet.
The tube utilizes a No. 4 phosphor screen, which produces a white fluorescent color and a white phosphorescent color with medium persistence. The grey filter faceplate of the 16HP4A provides approximately 70 percent light transmission at the center of the screen.
The external conductive coating forms a capacitor with the internal anode structure, which can be utilized for high-voltage ripple filtering:
The following maximum ratings are established under the Design Center system:
| Parameter | Value | Unit |
|---|---|---|
| Maximum DC Anode Voltage | 14,000 | 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 ≤ 15 s) | 410 | Volts |
| — Heater negative with respect to cathode (after warm-up) | 125 | Volts |
| — Heater positive with respect to cathode | 125 | Volts |
Under typical operating conditions, the 16HP4A is operated with an anode potential of 12,000 Volts. Focusing and ion-trap alignment are achieved using external magnetic components.
| Parameter | Typical Value | Unit |
|---|---|---|
| DC Anode Voltage | 12,000 | Volts |
| DC Grid No. 2 Voltage | 300 | Volts |
| DC Grid No. 1 Voltage (for visual extinction of undeflected focused spot) | -33 to -77 | Volts |
| DC Focusing Coil Current (Approximate) | 110 | mA |
| DC Ion Trap Current (Standard Coil #108, Approximate) | 120 | mA |
The 16HP4A is a 16-inch class, round glass, direct-view television picture tube utilizing magnetic focus and magnetic deflection. It features a unipotential cathode, a 6.3 V / 0.6 A heater, a No. 4 white phosphor screen with medium persistence, and a grey filter faceplate that provides 70 percent light transmission at the center. Operating typically at an anode voltage of 12,000 V, the tube requires an external double field ion trap magnet and a standard focusing coil to produce a 10 1/4" by 14 1/2" raster.
Small-shell Duodecal 5-contact CRT base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
CRT-specific anode/focus/deflection ratings retained as parameters rather than mapped to ordinary plate/screen fields.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Maximum Anode Voltage
14000 V
Typical Anode Voltage
12000 V
Maximum Grid2 Voltage
410 V
Typical Grid2 Voltage
300 V
DeflectionAngleApproximate
60 degree
FocusingMethod
Magnetic
DeflectingMethod
Magnetic
PhosphorNumber
4
FluorescentColor
White
Persistence
Medium
Data set 02
Published operating points and test conditions from this source.
NAGMETIC FOCUS 6 DEFLECTION
6
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
EXTERNAL DOUBLE FIELD ION TRAP — value 1
1
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
EXTERNAL DOUBLE FIELD ION TRAP — value 2
1
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
EXTERNAL DOUBLE FIELD ION TRAP — value 3
2
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DEFLECTION ANGLE (APPROX.)
60 degrees
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
3 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #1 VOLTAGE A — value 1
1 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #1 VOLTAGE A — value 2
33 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC GRID #1 VOLTAGE A — value 3
-77 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC ION TRAP CURRENT STANDARD COIL #108 (APPROX.)
108 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
SIGNAL VOLTAGE ADJUSTED TO PRODUCE A XI GXLIGXT BRIGHTNESS OF 20 F00T LAMBERTS ON a 10 1/4" BY — value 1
10 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
SIGNAL VOLTAGE ADJUSTED TO PRODUCE A XI GXLIGXT BRIGHTNESS OF 20 F00T LAMBERTS ON a 10 1/4" BY — value 2
1 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
SIGNAL VOLTAGE ADJUSTED TO PRODUCE A XI GXLIGXT BRIGHTNESS OF 20 F00T LAMBERTS ON a 10 1/4" BY — value 3
4 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
14 1/2" PICTURE SIZE. GIST ANLE FROM REf ERENCE LINE TO CENTER OF aIR GaP ON FOCUS COIL SH aLI BE — value 1
14
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
14 1/2" PICTURE SIZE. GIST ANLE FROM REf ERENCE LINE TO CENTER OF aIR GaP ON FOCUS COIL SH aLI BE — value 2
1
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
14 1/2" PICTURE SIZE. GIST ANLE FROM REf ERENCE LINE TO CENTER OF aIR GaP ON FOCUS COIL SH aLI BE — value 3
2
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM OC 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 OC GRID #2 VOLTAGE — value 2
4 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM GRID #1 CIRCUIT RESISTANCE
1 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.