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3WP1

Three-inch tight-tolerance industrial CRT with high sensitivity, improved perpendicularity, and a flat face to reduce parallax. Its P1 screen gives green fluorescence with medium persistence for precision instrument viewing.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: OCTALCRT8
Base pins: 10
Nominal heater: 6.3 V / 600 mA

Description

The Du Mont 3WP1 is a tight-tolerance industrial CRT with high sensitivity, improved perpendicularity, and flat face to reduce parallax. This variant uses a P1 screen with green fluorescence and medium persistence.

Socket description

Octal 8-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: OCTALCRT8
Base pins: 10
Nominal heater voltage: 6.3 V
Nominal heater current: 600 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

No fixed ratings are recorded for this section.

CRT-specific electrode voltages, deflection factors, capacitances, focus/cutoff data, and other published electrical values are stored as section parameters because the promoted section columns are primarily conventional valve fields.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Phosphor
P1
Focusing Method
Electrostatic
Deflecting Method
Electrostatic

Other

Typical Anode No. 2 Voltage
2000 V

Data set 02

1960 Du Mont

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Electrostatic text
Deflection Method
Electrostatic text
Phosphor
P1 text
Fluorescence
Green text
Persistence
Medium text

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
1 code
Electrostatic
Deflection method
1 code
Electrostatic
Deflection factor D1-D2 minimum
62 V/in
Deflection factor D1-D2 maximum
76 V/in
Deflection factor D3-D4 minimum
43 V/in
Deflection factor D3-D4 maximum
52 V/in
Useful screen / scan
1 code
2.75-inch minimum useful screen diameter
Deflection factor uniformity maximum
2 %
Pattern distortion maximum
2.5 %
At75PercentUsefulScan
Useful scan D1-D2
2.5 in
MinimumTotal
Useful scan D3-D4
2.25 in
MinimumTotal

Other

Anode No. 2 / accelerator voltage
1500 V
Focusing electrode voltage minimum
247 V
Focusing electrode voltage maximum
465 V
Grid No. 1 cutoff voltage minimum
-75 V
Grid No. 1 cutoff voltage maximum
-45 V
Grid No. 1 negative bias maximum
200 V

Capacitance

Cathode to all other electrodes minimum
3 pF
Approximate or published bound
Cathode to all other electrodes maximum
5.7 pF
Approximate or published bound
Grid No. 1 to all other electrodes minimum
4.6 pF
Approximate or published bound
Grid No. 1 to all other electrodes maximum
8.7 pF
Approximate or published bound
Deflection plates 1-2 capacitance minimum
1.7 pF
Approximate or published bound
Deflection plates 1-2 capacitance maximum
3.3 pF
Approximate or published bound
Deflection plates 3-4 capacitance minimum
1 pF
Approximate or published bound
Deflection plates 3-4 capacitance maximum
2 pF
Approximate or published bound

Data set 04

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Voltage
6.3 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Current — published value 1
0.6
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Current — published value 2
10
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Grid No.l to all other electrodes — published value 1
4.6
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Grid No.l to all other electrodes — published value 2
8.7
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 1 Heater — published value 1
1
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 1 Heater — published value 2
8
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 2 Grid No.l
2
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 3 Cathode
3
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 4 Grid No.3
4
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 12 - Heater
12
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 1
16 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 2
5 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 3
31 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Spot — published value 1
-3 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Spot — published value 2
-5 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
age for Focus. 165 to 310 — published value 1
247 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
age for Focus. 165 to 310 — published value 2
465 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
age for Focus. 165 to 310 — published value 3
330 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
age for Focus. 165 to 310 — published value 4
620 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Focused Spot — published value 1
-45 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Focused Spot — published value 2
-75 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Focused Spot — published value 3
-60 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Focused Spot — published value 4
-100 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
u nd eflected focused spot will fall within acircle of 3/16-inch radius — published value 1
3
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
u nd eflected focused spot will fall within acircle of 3/16-inch radius — published value 2
16
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
frequency scanning applied to deflecting electrodes DJ} and OJ 2. For
2
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
give a raster width of 6.9 cm with the grid-N o.3 voltage adjusted Lo
6.9 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Under the following conditions: heater voltage of 6.3 volts, grid-Na.3
6.3 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
DJ4 electrodes for a deflection of less than 75 per tent of the respec
75
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
SPOT WILL BE DEFLECTED TOWARD PIN 3: LIKEWISE, WITH DJ 3 — published value 1
3
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
SPOT WILL BE DEFLECTED TOWARD PIN 3: LIKEWISE, WITH DJ 3 — published value 2
3
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
GRID MODULATION — published value 1
92
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
GRID MODULATION — published value 2
9131
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
—_ GRID-N$3 VOLTS ADJUSTED FOR FOCUS
3 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.

Other

ULTOR VOLTAGE
2500 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
ULTOR INPUT (AVERAGE)
6 mA
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
GRID-No.3 VOLTAGE
1000 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Heater negative with respect to cathode
180 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Heater positive with respect to cathode
180 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Grid—No.l—Circuit Resistance
1.5 mA
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Cutoff•
50 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.