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SC2840

Three-inch high-brightness P1 cathode-ray tube with electrostatic focusing and electrostatic deflection. Sylvania documentation supports compact oscilloscope and specialized instrument-display applications.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: DUODECAL12
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

The Sylvania SC2840 is a 3-inch high-brightness P1 cathode-ray tube with electrostatic focus and deflection.

Socket description

Duodecal 12-contact color CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: DUODECAL12
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 ratings and characteristics promoted semantically from the approved source.

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

Characteristic

Phosphor
P1
Focusing Method
Electrostatic
Deflecting Method
Electrostatic

Data set 02

1965 Sylvania Electronic Tubes Vol3

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

Other

Maximum Anode2 Voltage
2250 V
Maximum Anode1 Voltage
1100 V
Maximum Grid Negative Bias
220 V
Maximum Grid Positive Peak
2 V
Maximum Heater-Cathode Voltage
140 V
EitherPolarity
Maximum Anode2-to-Deflection-Plate Voltage
550 V
Anode2 Voltage
1200 V
Focus Voltage Minimum
120 V
Anode1
Focus Voltage Maximum
400 V
Anode1
Grid Cutoff Voltage Minimum
-90 V
Grid Cutoff Voltage Maximum
-42 V
Deflection Factor Plates 1-2 Minimum
210 V/in
Deflection Factor Plates 1-2 Maximum
290 V/in
Deflection Factor Plates 3-4 Minimum
180 V/in
Deflection Factor Plates 3-4 Maximum
260 V/in