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2BP1

Two-inch oscilloscope and instrument cathode-ray tube with electrostatic focusing and deflection and a P1 screen. Its compact electron-optical system operates with anode voltage up to approximately 2 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Electrostatically focused and deflected oscilloscope/instrument CRT with P1 phosphor.

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

Max plate voltage: 2000 V
Max screen voltage: 500 V

Electrostatic oscillograph CRT.

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 General Electric Transmitting Types

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P1

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater Voltage . . . . . . . . . . ... . .... 6.3 Volts
6.3 V
Heater Voltage . . . . . . . . . . ... . .... 6.3 Volts
Anode No. 2 Voltage . . . . . . .. . ... ... 2750 Volts dc
2750 V
Anode No. 2 Voltage . . . . . . .. . ... ... 2750 Volts dc
Any Deflection Plate . . . . . . . . . . .. .. 550 Volts A Division of
550 V
Any Deflection Plate . . . . . . . . . . .. .. 550 Volts A Division of
Anode No. 2 Voltage? . . ., . . . . 1000 2000 Volts dc SENECA FALLS, NEW YORK
2000 V
Anode No. 2 Voltage? . . ., . . . . 1000 2000 Volts dc SENECA FALLS, NEW YORK
Anode No. 1 Voltage for Focus . . 150-280 300-560 Volts dc
-560 V
Anode No. 1 Voltage for Focus . . 150-280 300-560 Volts dc
2. Brilliance and definition decrease with decreasing Anode No. 2 Voltage. In general, Anode No. 2 V
2 V
2. Brilliance and definition decrease with decreasing Anode No. 2 Voltage. In general, Anode No. 2 Voltage should not be less

Other

Max. Grid Voltage Required for Cutoff3 ~67.5 -135 Volts dc
-135 V
Max. Grid Voltage Required for Cutoff3 ~67.5 -135 Volts dc

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
Electrostatic
Deflection method
Electrostatic
Heater voltage
6.3 V
Heater current
600 mA
Fluorescence
Green

Application

Application
Oscilloscope / precision instrument display

Other

Typical anode-2 voltage
2750 V
Typical anode-1 focus voltage
1100 V
Grid cutoff voltage range
-67.5 to -135 V
Anode-2 voltage maximum
3000 V

Data set 04

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
600 mA
Peak heater-cathode voltage, heater negative
125 V
Typical final accelerating anode voltage
1500 V
Maximum deflecting electrode voltage
550 V

Construction

Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P1

Characteristic

Fluorescence
Green
Persistence
Medium

Capacitance

Grid #1 to all other electrodes capacitance
8 pF
Approximate

Application

Application
Oscillograph/cathode-ray display