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19FEP4B

Wide-angle aluminized P4 monochrome television picture tube using electrostatic focusing and magnetic deflection, designed for high-voltage direct-view service with a large approximately 19-inch screen.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 450 mA

Description

19FEP4B Picture Tube

The 19FEP4B is a PAN-O-PLY type cathode-ray picture tube designed for television display applications. It features low-voltage electrostatic focusing and a 114-degree magnetic deflection system. The tube utilizes an electron gun design that does not require an ion-trap magnet, incorporating a unipotential focus lens to maintain image clarity.

Physical and Optical Characteristics

The 19FEP4B is constructed with a filterglass faceplate that provides approximately 48% light transmission at its center, enhancing display contrast. The screen is coated with an aluminized P4-sulfide type phosphor.

Mechanically, the tube weighs approximately 15 pounds and has a projected screen area of 172 square inches. Its physical dimensions are characterized by an overall length of 11.625 ± 0.250 inches and a neck length of 4.375 ± 0.125 inches. The envelope includes a regular-band type external conductive coating with a grounding contact located near the reference line, which integrates implosion protection hardware.

Electrical Connections and Pinout

The tube utilizes a Small-Button Neoeightar 7-Pin base (Arrangement 1, JEDEC No. B7-208) along with a Recessed Small Cavity cap (JEDEC No. J1-21) for the high-voltage anode connection. The electrical connections, viewed from the bottom of the base (8HR arrangement), are assigned as follows:

Pin / Cap	Connection
Pin 1	Heater
Pin 2	Grid No. 1
Pin 3	Grid No. 2
Pin 4	Grid No. 4
Pin 6	Grid No. 1
Pin 7	Cathode
Pin 8	Heater
Cap	Anode (Grid No. 3, Grid No. 5, Screen, Collector)
C	External Conductive Coating

Heater Ratings and Interelectrode Capacitances

The 19FEP4B heater is designed for a typical operating voltage of 6.3 V, with a design-maximum range spanning from a minimum of 5.7 V to a maximum of 6.9 V. At the nominal 6.3 V, the heater draws a current of 450 ± 20 mA. The average heater warm-up time is 11 seconds.

The direct interelectrode capacitances of the tube are:

Cathode to all other electrodes: 5 pF
Grid No. 1 to all other electrodes: 6 pF
External conductive coating to anode: 1250 pF minimum to 1750 pF maximum

Design-Maximum Ratings

The following design-maximum limits are established for the 19FEP4B. Unless otherwise noted, all voltages are positive with respect to Grid No. 1:

Parameter	Rating Value
Anode Voltage	12,000 Min to 23,500 Max V
Grid No. 4 Voltage	Positive 1,250 Max V / Negative 400 Max V
Grid No. 2 Voltage	20 Min to 60 Max V
Cathode Voltage (Negative Peak)	2 Max V
Cathode Voltage (Negative Bias)	0 Max V
Cathode Voltage (Positive Bias)	100 Max V
Cathode Voltage (Positive Peak)	150 Max V
Grid No. 1 Circuit Resistance	1.5 Max MΩ

Heater-Cathode Voltage Limits

Heater negative to cathode: 450 V maximum during the first 15 seconds of warm-up; 300 V maximum after warm-up.
Heater positive to cathode: 200 V maximum (combined AC and DC); 100 V maximum for the DC component.

Typical Operating Conditions (Cathode-Drive Service)

Under typical cathode-drive operating conditions, with voltages specified positive with respect to Grid No. 1, the operating parameters are:

Anode Voltage: 16,000 V
Grid No. 4 Voltage: 100 V (with an optimum focus range of -100 V to +300 V at an anode current of 100 µA)
Grid No. 2 Voltage: 30 V
Cathode Voltage (for visual extinction of focused raster): 22 V to 45 V
Centering Magnet Field Strength: 0 to 8 Gauss

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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: 23500 V
Max screen voltage: 60 V

Pan-O-Ply low-grid-2 aluminized P4 cathode-drive picture tube.

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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Heater current
450 mA
Heater warm-up time
11 s
Maximum anode/ultor voltage
23500 V
Minimum anode/ultor voltage
12000 V
Typical anode/ultor voltage
16000 V
PictureTubeService
Maximum grid No.2 voltage
60 V
Typical grid No.2 voltage
30 V
PictureTubeService
Focus-voltage range minimum
-100 V
OptimumFocus
Focus-voltage range maximum
300 V
OptimumFocus
Visual-extinction voltage range minimum
22 V
FocusedRasterExtinction
Visual-extinction voltage range maximum
45 V
FocusedRasterExtinction
Maximum grid No.1 circuit resistance
1.5 megohm
X-ray shielding warning
Present
HighAnodeVoltage
Maximum cathode positive bias voltage
100 V
CathodeDrive
Maximum cathode positive peak voltage
150 V
CathodeDrive
Maximum cathode negative peak voltage
2 V
CathodeDrive
Peak heater-cathode voltage during warm-up
450 V
HeaterNegative;Warmup<=15s
Peak heater-cathode voltage after warm-up
300 V
HeaterNegative
Peak heater-cathode voltage heater positive
200 V
HeaterPositive
Adjustable centering magnet field strength maximum
8 gauss
Approximate

Construction

Focusing method
LowVoltageElectrostatic
Focus lens
Unipotential
Deflection method
Magnetic
Phosphor
P4
Screen type
Aluminized white
P4

Characteristic

Deflection angle
114 deg
Approximate

Capacitance

Cathode to all other electrodes capacitance
5 pF
Approximate
External conductive coating to anode capacitance minimum
1250 pF
Approximate
External conductive coating to anode capacitance maximum
1750 pF
Approximate