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4MP1

Three-and-one-half-inch square direct-view oscilloscope CRT with electrostatic focusing and deflection plus post-deflection acceleration. Its P1 screen provides a green medium-persistence trace for instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Three-and-one-half-inch square direct-view oscilloscope CRT with electrostatic focus, electrostatic deflection, and post-deflection acceleration.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12A
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

No fixed ratings are recorded for this section.

Published source values promoted where applicable.

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

Characteristics

Focusing method
Electrostatic
Deflection method
Electrostatic

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
68 V/in
Deflection factor D1-D2 maximum
82 V/in
Deflection factor D3-D4 minimum
42 V/in
Deflection factor D3-D4 maximum
52 V/in
Useful screen / scan
1 code
2.875 x 2.875-inch minimum useful square scan
Deflection factor uniformity maximum
2 %
Pattern distortion maximum
2 %
Useful scan
2.875 in
MinimumSquareDimension

Other

Anode No. 2 / accelerator voltage maximum
3300 V
Post-accelerator / Anode No. 3 voltage maximum
6600 V
Anode No. 2 / accelerator voltage
2000 V
Post-accelerator / Anode No. 3 voltage
4000 V
Focusing electrode voltage maximum
1100 V
Focusing electrode voltage minimum
340 V
Focusing electrode voltage maximum
510 V
Grid No. 1 cutoff voltage minimum
-87 V
Grid No. 1 cutoff voltage maximum
-52 V
Peak heater-to-cathode voltage
200 V
Peak voltage between accelerator and any deflection plate
600 V
Grid No. 1 negative bias maximum
200 V