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Rectifier - TV Line Scan Boost ·Rectifier

2AS2A

Duodecar high-voltage vacuum rectifier for pulse circuits in color television receivers. Its specialized role is flyback-derived picture-tube accelerating-voltage generation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
12EW
Socket code
B7G
Base pins
12
Nominal heater
2.5 V / 400 mA

Description

Duodecar half-wave vacuum rectifier for high-voltage pulse circuits in color television receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12EW
Socket code
B7G
Base pins
12
Nominal heater voltage
2.5 V
Nominal heater current
400 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12EW - 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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
24000 V
Rectifier nominal output current
8 mA
Rectifier peak forward current
90 mA
Rectifier forward voltage drop
75 V
Rectifier max heater-cathode voltage
2.9 V

Promoted values are taken from the printed ratings on the uploaded source; additional non-promoted values are retained in TUBE_SECTION_PARAMETER.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • HeaterOrFilamentVoltageNominal

    2.5 V

  • HeaterOrFilamentCurrentNominal

    400 mA

  • RectifierMaximumPeakInverseVoltage

    24000 V

  • RectifierNominalOutputCurrent

    8 mA

  • RectifierMaximumHeaterCathodeVoltage

    2.9 V

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Peak Plate Current

    90 mA

    Published in approved target datasheet entry

  • Average Plate Current

    1.7 mA

    Published in approved target datasheet entry

  • Tube Voltage Drop for plate current of

    7 mA

    Published in approved target datasheet entry

  • Tube Voltage Drop for plate current of 7 mA

    75 V

    Published in approved target datasheet entry

  • Statistical value controlled on a lot sampling basis

    25 mR/hr

    Published in approved target datasheet entry

Characteristic

  • * The dc component must not exceed

    24000 V

    Published in approved target datasheet entry