Specialized - Cathode Ray ·CathodeRay
Direct-view cathode-ray picture tube documented by manufacturer data for type 16RP4A; available extracted technical detail is limited, so the description remains conservative.
The 16RP4A is a rectangular glass, direct-view cathode ray picture tube designed for television applications. It is identical to the 16RP4 except that the 16RP4A features an aluminized screen. Both tubes share a suite of common design features, including a grey filter faceplate, a unipotential cathode, magnetic focus and deflection, an external single field ion trap, and an external conductive coating. The standard raster size for these tubes is 10 1/8 inches by 13 1/2 inches.
The 16RP4A is constructed using rectangular glass. Its physical dimensions and mechanical characteristics are precisely defined:
The tube utilizes a 5-pin base configuration. The pin connections, viewed from the bottom of the tube, are assigned as follows:
| Pin Number | Connection |
|---|---|
| Pin 1 | Heater |
| Pin 2 | Grid No. 1 |
| Pin 10 | Grid No. 2 |
| Pin 11 | Cathode |
| Pin 12 | Heater |
| Cap | Anode (Recessed small cavity cap J1-21) |
The electrical ratings of the 16RP4A are interpreted according to the Design Center System. Operating the tube within these limits is necessary for reliable performance.
The approximate direct interelectrode capacitances of the tube are:
The optical performance and typical operating parameters of the 16RP4A are optimized for television display systems.
The tube employs magnetic focusing and magnetic deflection. The approximate deflection angles are:
Under typical operating conditions, the tube is configured with the following electrical parameters:
The typical focusing coil current of 100 ± 20% mA is specified for a standard focus coil No. 109 (or equivalent), with the combined Grid No. 1 bias voltage and video signal voltage adjusted to produce a highlight brightness of 30 foot-lamberts on a 10 1/8 inch by 13 1/2 inch picture size. The distance from the reference line to the center of the air gap on the focus coil is specified as 3.50 inches.
The 16RP4A is a rectangular glass, direct-view television picture tube featuring an aluminized screen, magnetic focus, and magnetic deflection. It operates with a 6.3 V, 0.6 A heater and is housed in a bulb with a small shell duodecal 5-pin base (B5-57) and a recessed small cavity cap (J1-21) for the anode connection. The tube utilizes a No. 4 white phosphor with medium persistence, providing a light transmission of approximately 66% at the center of its grey filter faceplate. Designed for television applications, it supports a maximum DC anode voltage of 16,000 V and requires an external single field ion trap for proper operation.
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
16000 V
Typical Anode Voltage
12000 V
Maximum Grid2 Voltage
410 V
Typical Grid2 Voltage
300 V
DeflectionAngleApproximate
70 degree
FocusingMethod
Magnetic
DeflectingMethod
Magnetic
PhosphorNumber
4
FluorescentColor
White
Persistence
Medium
Data set 02
Published operating points and test conditions from this source.
MAGNETIC FOCUS b DEFLECTION — value 1
13 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAGNETIC FOCUS b DEFLECTION — value 2
1 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAGNETIC FOCUS b DEFLECTION — value 3
2 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
HEATER
6.3 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
OC ANODE VOLTAGE
12000 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
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.
OC 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 #i VOLTAGE A
77 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
OC FOCUSING COIL CURRENT S (APPROX.)
2 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC ION TRAP CURRENT STANDARD COIL #111 (APPROX.) — value 1
111 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC ION TRAP CURRENT STANDARD COIL #111 (APPROX.) — value 2
75 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DC ION TRAP CURRENT STANDARD COIL #111 (APPROX.) — value 3
5 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
DFOR STANDARD FOCUS COIL N109 r OR EDUIVALEXT r WITH THE COMBINED GRID #1 BIAS VOLTAGE AND VI DEC
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 NiGXL IGHT BRIGMTNEGG OF j0 F00T LAMBERTS OX A 10 1/8" — 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 NiGXL IGHT BRIGMTNEGG OF j0 F00T LAMBERTS OX A 10 1/8" — 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 NiGXL IGHT BRIGMTNEGG OF j0 F00T LAMBERTS OX A 10 1/8" — value 3
8 V
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
lj 1/2" PICTURE SIZE. DISTANCE FROM REFERENCE LINE TO CENTER OF AIR GAP OX FOCUS COIL GN ALL BE — value 1
1
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
lj 1/2" PICTURE SIZE. DISTANCE FROM REFERENCE LINE TO CENTER OF AIR GAP OX FOCUS COIL GN ALL BE — value 2
2
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
MAXIMUM DC ANODE
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 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 #1 CIRCUIT RESISTANCE — value 2
1.5 mA
Published CRT datasheet value; multiple values on a row represent the source table's separate conditions/limits.
Data set 03
Published operating points and test conditions from this source.
HeaterOrFilamentVoltageNominal
6.3 V
HeaterOrFilamentCurrentNominal
600 mA