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3BMP11

Three-inch direct-view oscilloscope CRT with electrostatic focusing and deflection and high-voltage accelerating operation. Its P11 blue, short persistence screen provides the persistence characteristics needed for oscillographic instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Sylvania 3BMP11 direct-view oscilloscope CRT with electrostatic focus/deflection; P11 blue, short persistence. Published maximum ratings, capacitances, and typical operating conditions were extracted from the supplied datasheet.

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

Max plate voltage: 6600 V

Published CRT maximum ratings, capacitances, and operating conditions extracted from supplied Sylvania datasheet.

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

Characteristic

Heater Voltage
6.3 V
Heater Current
600 mA
FocusingMethod
Electrostatic
DeflectionMethod
Electrostatic
Phosphor
P11 blue, short persistence
MinimumUsefulScreen
2.68 in
DeflectionFactorUniformityMaximum
2 %
PatternDistortionMaximum
2 %
ModulationMaximum
38 V
Anode3Current=25uA
LineWidthMaximum
0.016 in
Anode3Current=25uA

Other

Anode3VoltageMaximum
6600 V
Anode2VoltageMaximum
2200 V
Anode1FocusVoltageMaximum
1500 V
GridNegativeBiasMagnitudeMaximum
200 V
GridPositivePeakVoltageMaximum
0 V
PeakHeaterCathodeVoltageNegative
50 V
PeakVoltageAnode2ToDeflectionPlate
550 V
Anode3Voltage
4000 V
Anode2Voltage
2000 V
Anode1VoltageForFocus
375-575 V
GridVoltageForCutoff
-45 to -75 V
DeflectionFactorPlates1_2
180-220 V/in
DeflectionFactorPlates3_4
133-163 V/in
GridCircuitResistanceMaximum
1.5 Mohm
DeflectionCircuitResistanceMaximum
5 Mohm
Anode3ToAnode2VoltageRatioMaximum
3
Anode2PowerInputMaximum
6 W
Except3BMP12AverageRatingNote