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3AQP11

Three-inch oscilloscope and instrument cathode-ray tube with electrostatic focusing and electrostatic deflection and a P11 screen. Manufacturer documentation supports compact waveform, measurement, and indicator-display service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B14A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Electrostatically focused and deflected oscilloscope/instrument CRT with P11 phosphor.

Socket description

Large readout/Nixie 14-contact base, 44.5 mm pin circle

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B14A
Base pins: -
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: 3000 V

Published electrostatic CRT ratings, focus/deflection conditions, capacitances, and post-deflection-acceleration data retained where legible.

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

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
Blue

Application

Application
Oscilloscope / precision instrument display

Other

Anode-2 voltage maximum
3000 V
Anode-2 input maximum
6 W
Anode-1 focus voltage maximum
1200 V
Typical anode-2 voltage
2000 V
Focus voltage range
330 to 620 V
Grid cutoff voltage range
-58 to -135 V