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3RP1A

Short flat-face three-inch Du Mont oscilloscope CRT for low- and medium-voltage applications, combining high deflection sensitivity with a P1 green medium-persistence screen for general waveform 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 3RP1A is a short flat-face three-inch CRT for low- and medium-voltage oscillographic applications with high sensitivity. 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

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 02

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
146 V/in
Deflection factor D1-D2 maximum
198 V/in
Deflection factor D3-D4 minimum
104 V/in
Deflection factor D3-D4 maximum
140 V/in
Useful screen / scan
1 code
3-inch round direct-view screen
Phosphor designation
1 code
P1

Other

Anode No. 2 / accelerator voltage maximum
2750 V
Anode No. 2 / accelerator voltage
2000 V
Focusing electrode voltage maximum
1100 V
Focusing electrode voltage minimum
330 V
Focusing electrode voltage maximum
620 V
Grid No. 1 cutoff voltage minimum
-135 V
Grid No. 1 cutoff voltage maximum
-45 V
Peak heater-to-cathode voltage
140 V
Peak voltage between accelerator and any deflection plate
550 V
Grid No. 1 negative bias maximum
220 V

Data set 03

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Voltage
63 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
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Current — published value 2
6
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Current — published value 3
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
8
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 Na.l — published value 1
2
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Pin 2 - Grid Na.l — published value 2
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.
With DJ1 positive with respect to DJ 2, the spot is deflected
2
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
toward pin 4. With DJ3 positive with respect to DJq, the spot
4
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
PEAK V-0LTAGE BETWEEN ULTOR AND
0
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
For any ultor voltage (Ec41 6etveen goo` and 25oovolts — published value 1
6 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
For any ultor voltage (Ec41 6etveen goo` and 25oovolts — published value 2
25 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 1
16.5 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 2
31 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Spot
6.75 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
to its deflection. rn the 7RP1-A, the ultor function Is Derformetl by
7
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
grid No. 4. Since grid No. u, grid No. 2, and collector are connected to — published value 1
4
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
grid No. 4. Since grid No. u, grid No. 2, and collector are connected to — published value 2
2
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
1/# The center of the undefl ec tetl focused spot will fall within a circle
1
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
For ultor voltages of
2000 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 1
165 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
310 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
330 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
for Focus — published value 4
620 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Spot — published value 1
-67.5 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Spot — published value 2
-135 V
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Capacitors
5 ohm
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
GRID -N>'3 VOLTS
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
125 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
125 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 — published value 1
1 mA
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.
Grid-No.l-Circuit Resistance — published value 2
5 mA
Published CRT datasheet value; where a source row has several numbers they represent its separate limits or operating conditions.