Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Phosphor
P4
Focusing method
Electrostatic
Deflection method
Magnetic
Other
Heater voltage
6.3 V
Heater current
600 mA
Specialized - Cathode Ray ·CathodeRay
19EDP4
Nineteen-inch direct-view monochrome television CRT with electrostatic focus, magnetic deflection, and an aluminized P4 white screen. Wide-angle scanning and high-voltage operation suit large-screen receiver service, with published X-ray precautions.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 8HR
- Socket code
- -
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
19EDP4 — Television Picture Tube
The 19EDP4 is a 19-inch direct-viewed rectangular glass television picture tube. It features electrostatic focusing, magnetic deflection, and an aluminized screen. Designed without an ion trap, the tube incorporates integral banded implosion protection and an external conductive coating. The 19EDP4 is characterized as the high anode voltage version of the television picture tube family, in contrast to the low anode voltage 19EHP4.
Mechanical Design and Physical Characteristics
The 19EDP4 utilizes a J149F glass bulb with a gray filter glass faceplate that provides approximately 49% light transmittance. The screen is coated with an aluminized P4 phosphor, which exhibits white fluorescence and medium-short persistence.
The physical dimensions and mechanical limits of the tube are as follows:
- Overall Length: 11 3/8 ± 1/4 inches to 11 5/8 ± 1/4 inches
- Neck Length: 4 3/8 ± 1/8 inches
- Neck Diameter: 1 1/8 inches
- Minimum Useful Screen Dimensions: 12 inches in height, 15 3/8 inches in width, and 17 9/16 inches diagonally
- Minimum Useful Screen Area: 172 square inches
- Weight: Approximately 15 lbs
For proper operation, the external conductive coating and rimbands must be grounded. The electrical resistance between the external conductive coating and the rimband is specified at a minimum of 50 MΩ.
Deflection Angles
The tube is designed for wide-angle magnetic deflection with the following approximate angles:
- Diagonal Deflection: 114°
- Horizontal Deflection: 101°
- Vertical Deflection: 86°
Electrical Characteristics and Heater Ratings
The 19EDP4 features an indirectly heated cathode with a controlled warm-up time. The electrical specifications for the heater and the interelectrode capacitances are detailed below:
| Parameter | Value |
|---|---|
| Heater Voltage | 6.3 V |
| Heater Current | 0.60 ± 5% A |
| Heater Warm-up Time | 11 seconds |
Direct Interelectrode Capacitances
- Cathode to all other electrodes: Approximately 5 pF
- Grid No. 1 to all other electrodes: Approximately 6 pF
- External conductive coating and rimbands to anode: 1000 pF minimum, 1500 pF maximum
Pinout and Basing Diagram
The tube uses a B7-208 base and follows the 8HR basing diagram. The electrical connections are assigned as follows:
- Pin 1: Heater
- Pin 2: Grid No. 1
- Pin 3: Grid No. 2
- Pin 4: Grid No. 4 (Focusing Electrode)
- Pin 6: Grid No. 1
- Pin 7: Cathode
- Pin 8: Heater
- Recessed Cap: Anode (Recessed small cavity cap, J1-21)
Pin 4 (the focusing electrode) is aligned with the horizontal centerline (A-A') within an angular tolerance of 30° and is positioned on the same side of the neck as the recessed anode contact.
Operating Modes and Maximum Ratings
The 19EDP4 can be operated in either Grid Drive Service or Cathode Drive Service. The maximum ratings are defined under the Design Maximum Rating System.
Design Maximum Ratings
| Parameter | Grid Drive Service | Cathode Drive Service |
|---|---|---|
| Anode Voltage (DC) | 15,000 V min / 23,000 V max | 15,000 V min / 23,000 V max |
| Grid No. 4 Voltage (Focusing Electrode) | -550 to +1100 V dc | -400 to +1250 V dc |
| Grid No. 2 Voltage (DC) | 200 V min / 550 V max | 350 V min / 700 V max |
| Grid No. 1 Voltage (Negative Bias) | 155 V dc | — |
| Grid No. 1 Voltage (Negative Peak) | 220 V | — |
| Grid No. 1 Voltage (Positive Bias) | 0 V dc | — |
| Grid No. 1 Voltage (Positive Peak) | 2 V | — |
| Cathode Voltage (Positive Bias) | — | 155 V dc |
| Cathode Voltage (Positive Peak) | — | 220 V |
| Cathode Voltage (Negative Bias) | — | 0 V dc |
| Cathode Voltage (Negative Peak) | — | 2 V |
| Max Grid No. 1 Circuit Resistance | 1.5 MΩ | 1.5 MΩ |
Peak Heater-Cathode Voltage Ratings
The limits for the voltage between the heater and cathode depend on the service mode and whether the equipment has warmed up:
- Grid Drive Service:
- Heater negative with respect to cathode (during warm-up ≤ 15 s): 450 V max
- Heater negative with respect to cathode (after warm-up): 200 V max
- Heater positive with respect to cathode: 200 V max
- Cathode Drive Service:
- Heater negative with respect to cathode (during warm-up ≤ 15 s): 450 V max
- Heater negative with respect to cathode (after warm-up): 300 V max (with a maximum DC component of 200 V)
- Heater positive with respect to cathode: 200 V max (with a maximum DC component of 100 V)
Typical Operating Conditions
Under typical operating conditions, both drive services utilize an anode voltage of 20,000 V DC and a Grid No. 2 voltage of 400 V DC.
| Parameter | Grid Drive Service | Cathode Drive Service |
|---|---|---|
| Anode Voltage (DC) | 20,000 V | 20,000 V |
| Grid No. 4 Voltage for Focus | 0 to 400 V dc | 0 to 400 V dc |
| Grid No. 2 Voltage (DC) | 400 V | 400 V |
| Voltage Required for Cutoff | -46 to -94 V dc (Grid No. 1) | 42 to 78 V dc (Cathode) |
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8HR
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8HR - 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
- 23000 V
Cathode-ray picture-tube section; anode rating and published direct capacitances captured from supplied family sheet.
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 02
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
Heater Voltage
6.3 V
Heater Current
600 mA
FocusingMethod
Electrostatic
DeflectionMethod
Magnetic
Phosphor
Aluminized P4 white
DeflectionAngles
110-class magnetic
Cathode To All Capacitance
5 pF
Grid1 To All Capacitance
6 pF
ExternalConductiveCoatingToAnodeCapacitanceMaximum
1500 pF
ExternalConductiveCoatingToAnodeCapacitanceMinimum
1000 pF
RimbandToExternalCoatingResistanceMinimum
50 Mohm
Other
AnodeVoltageMaximum
23000 V
AnodeVoltageMinimum
15000 V
FocusingElectrodeVoltageRangeMaximum
-400 to +1250 V
Grid2VoltageMaximum
700 V
Grid2VoltageMinimum
350 V
Grid1NegativeBiasMagnitudeMaximum
155 V
Grid1PositivePeakVoltageMaximum
2 V
HeaterCathodeVoltageMaximum
450 V
Warmup<=15s;HeaterNegative
HeaterCathodeVoltageMaximum
200 V
AfterWarmup
HeaterCathodeVoltageMaximum
200 V
HeaterPositive
Anode Voltage
20000 V
FocusingElectrodeVoltage
0 to +400 V
Grid1VoltageForCutoff
-46 to -94 V
Grid1CircuitResistanceMaximum
1.5 Mohm