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
19DNP4
Nineteen-inch direct-view monochrome television CRT with electrostatic focus, magnetic deflection, and an aluminized P4 white screen. Wide-angle deflection and high-voltage operation provide a bright large-screen receiver image, 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
19DNP4 — Television Picture Tube
The 19DNP4 is a 19-inch direct-viewed rectangular glass television picture tube designed for use in television receivers. It features a low anode voltage design, electrostatic focusing, and a 114-degree magnetic deflection system. The tube incorporates a bonded shield, gray filter glass, an aluminized screen, and an external conductive coating. It operates without an ion trap and has a 1-1/8 inch neck diameter.
Physical Construction and Envelope
The 19DNP4 is constructed using a J149C glass bulb and features a FP149B1 safety plate that is 1/8 inch thick with a light transmittance of 70%. The complete faceplate assembly has an overall light transmittance of approximately 60%. The tube weighs approximately 15.5 lbs.
Electrical connection to the anode is made via a recessed small cavity cap (J1-21), while the base is a B7-208 type utilizing the 8HR basing arrangement. The tube's external conductive coating forms a capacitor with the internal anode, providing a capacitance of 1000 pF minimum to 1500 pF maximum.
The deflection system is designed for magnetic deflection with the following approximate angles:
- Diagonal: 114°
- Horizontal: 101°
- Vertical: 86°
Heater and Pinout Configuration
The 19DNP4 is equipped with an indirectly heated cathode. The heater has a controlled warm-up time of 11 seconds.
| Heater Parameter | Value |
|---|---|
| Nominal Heater Voltage | 6.3 V |
| Nominal Heater Current | 0.60 ± 5% A |
| Heater Warm-up Time | 11 seconds |
The 8HR base pinout configuration, viewed from the bottom of the tube, is as follows:
- Pin 1: Heater (H)
- Pin 2: Grid No. 1 (G1)
- Pin 3: Grid No. 2 (G2)
- Pin 4: Grid No. 4 (G4, Focusing Electrode)
- Pin 6: Grid No. 1 (G1)
- Pin 7: Cathode (K)
- Pin 8: Heater (H)
- Recessed Cavity Cap: Anode (A)
Note that Grid No. 1 is connected to both Pin 2 and Pin 6.
Interelectrode Capacitances
The approximate 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: 1000 pF (minimum) / 1500 pF (maximum)
Operating Services and Design-Maximum Ratings
The 19DNP4 can be operated in either Grid Drive Service or Cathode Drive Service. The ratings are defined under the Design-Maximum System.
Grid Drive Service
In Grid Drive Service, the control signal is applied to Grid No. 1. The absolute and design-maximum ratings are:
- Anode Voltage: 10,000 V to 18,000 V dc
- Grid No. 4 Voltage (Focusing Electrode): -550 V to +1100 V dc
- Grid No. 2 Voltage: 200 V to 550 V dc
- Grid No. 1 Voltage:
- Negative Bias Value: 155 V dc
- Negative Peak Value: 220 V
- Positive Bias Value: 0 V dc
- Positive Peak Value: 2 V
Cathode Drive Service
In Cathode Drive Service, the control signal is applied to the cathode. The absolute and design-maximum ratings are:
- Anode Voltage: 10,000 V to 18,000 V dc
- Grid No. 4 Voltage (Focusing Electrode): -400 V to +1250 V dc
- Grid No. 2 Voltage: 350 V to 700 V dc
- Cathode Voltage:
- Positive Bias Value: 155 V dc
- Positive Peak Value: 220 V
- Negative Bias Value: 0 V dc
- Negative Peak Value: 2 V
Heater-Cathode Voltage Ratings (Both Services)
The peak heater-cathode voltage limits are identical for both Grid Drive and Cathode Drive configurations:
- Heater negative with respect to cathode (during warm-up ≤ 15 seconds): 450 V maximum
- Heater negative with respect to cathode (after warm-up): 200 V maximum
- Heater positive with respect to cathode: 200 V maximum
Maximum Circuit Values
- Grid No. 1 Circuit Resistance: 1.5 Megohms maximum
Typical Operating Conditions
The tube's typical operating parameters are specified for both drive methods at an anode voltage of 16,000 V dc.
Grid Drive Typical Operation
- Anode Voltage: 16,000 V dc
- Grid No. 4 Voltage for Focus: 0 to 400 V dc
- Grid No. 2 Voltage: 400 V dc
- Grid No. 1 Voltage Required for Cutoff: -40 to -76 V dc
Cathode Drive Typical Operation
- Anode Voltage: 16,000 V dc
- Grid No. 4 Voltage for Focus: 0 to 400 V dc
- Grid No. 2 Voltage: 400 V dc
- Cathode Voltage Required for Cutoff: 36 to 68 V dc
Technical Summary
The 19DNP4 is a 19-inch rectangular glass television picture tube featuring a 114° diagonal magnetic deflection angle, electrostatic focusing, and a low anode voltage design. It utilizes a 6.3 V, 0.60 A heater with an 11-second warm-up time and is housed in a J149C bulb with an 8HR base configuration. Designed for both Grid Drive and Cathode Drive television receiver applications, it operates with typical anode voltages around 16,000 V dc, providing a robust and integrated display solution with its bonded safety shield and external conductive coating.
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
- 18000 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
18000 V
AnodeVoltageMinimum
10000 V
FocusingElectrodeVoltageRangeMaximum
-400 to +1250 V
Grid2VoltageMaximum
550 V
Grid2VoltageMinimum
200 V
Grid1NegativeBiasMagnitudeMaximum
140 V
Grid1PositivePeakVoltageMaximum
2 V
HeaterCathodeVoltageMaximum
450 V
Warmup<=15s;HeaterNegative
HeaterCathodeVoltageMaximum
200 V
AfterWarmup
HeaterCathodeVoltageMaximum
200 V
HeaterPositive
Anode Voltage
16000 V
FocusingElectrodeVoltage
0 to +400 V
Grid1VoltageForCutoff
-40 to -76 V
Grid1CircuitResistanceMaximum
1.5 Mohm