Specialized - Cathode Ray ·CathodeRay
P4 monochrome television picture tube using magnetic deflection and high-voltage direct-view operation; manufacturer documentation for 19EP4 provides focusing, deflection, and beam-control characteristics for television picture service.
The 19EP4 is a direct-view rectangular glass picture tube designed for television receiver applications. It features a grey filter faceplate, magnetic focus, and magnetic deflection. The tube incorporates a unipotential cathode, an external double field ion trap, and a standard phosphor screen that provides a white display with medium persistence.
The 19EP4 is constructed with a rectangular glass envelope and a grey filter faceplate to enhance picture contrast under ambient illumination. The tube provides a nominal raster size of 12" x 16", with a minimum useful screen diameter of 17 21/32 inches.
The 19EP4 utilizes a 5-pin duodecal base (B5-57) with the 12D basing configuration. The electrical connections, viewed from the bottom of the base, are assigned as follows:
| Pin Number | Connection |
|---|---|
| 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 (Recessed small cavity cap J1-21) |
The following design-center values represent the absolute operating limits established for the 19EP4 to ensure reliable performance and prevent premature tube failure:
Under typical operating conditions, the 19EP4 is operated with magnetic focusing and deflection systems. The deflection angles are approximately 65 degrees horizontally and 70 degrees diagonally.
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 electrode, focusing and deflection data retained as parameters.
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
19000 V
Typical Anode Voltage
13000 V
Maximum Grid2 Voltage
410 V
Typical Grid2 Voltage
300 V
DeflectionAngleApproximate
66 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 AND DEFLECTION — value 1
12 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAGNETIC FOCUS AND DEFLECTION — value 2
16 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
HEATER
6.3 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
HEATER POSITIVE
125
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC ANODE VOLTAGE
13 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC GRID #2 VOLTAGE — value 2
25 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC GRID #i VOLTAGE A — value 1
26 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC GRID #i VOLTAGE A — value 2
63 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC FOCUSING COIL CURRENTS (APPROX.) — value 1
95 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC FOCUSING COIL CURRENTS (APPROX.) — value 2
2 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
BFOR STANDARD FO LUS COiI 1109r OR EOUI VAL EMT r WITn TXE COMBINED GRID !1 BIAS VOLTAGE AND — value 1
1109 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
BFOR STANDARD FO LUS COiI 1109r OR EOUI VAL EMT r WITn TXE COMBINED GRID !1 BIAS VOLTAGE AND — value 2
1 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
VIDEO SIGNAI VOLTAGE AOJU STED TO PRODUCE A MIGNLIGHT BRI GMTNESS OF 25 FDOT LAMBERTS ON A
25 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
12" x 16" PICTURE SIZE. DISTANCE FROM REFERENCE IINE TO LEX7ER OF AIR GAP OM FOCUS — value 1
12
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
12" x 16" PICTURE SIZE. DISTANCE FROM REFERENCE IINE TO LEX7ER OF AIR GAP OM FOCUS — value 2
16
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC ANODE
19 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM pC GRID #2 VOLTAGE
2 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 VOLTAGE
1 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 CIRCUIT RESISTANCE — value 1
1 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 CIRCUIT RESISTANCE — value 2
1.5 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.