Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Rectifier - TV Line Scan Boost ·Rectifier

2BU2

Duodecar high-voltage vacuum rectifier for supplying picture-tube anode voltage in television receivers. Its specialized construction supports flyback-derived CRT accelerating-voltage service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
12JB
Socket code
B12C
Base pins
12
Nominal heater
2.5 V / 330 mA

Description

Duodecar half-wave high-voltage vacuum rectifier for supplying picture-tube anode voltage in television receivers; source co-designates 2BU2/2AH2.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12JB
Socket code
B12C
Base pins
12
Nominal heater voltage
2.5 V
Nominal heater current
330 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12JB - 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
30000 V
Rectifier nominal output current
8 mA
Rectifier peak forward current
80 mA
Rectifier forward voltage drop
60 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

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Heater/filament voltage

    2.5 V

  • Heater/filament current

    330 mA

  • Peak inverse plate voltage total DC plus peak

    30000 V

    PulsedRectifier

  • Maximum DC component of inverse plate voltage

    24000 V

    PulsedRectifier

  • Peak plate current

    80 mA

    PulsedRectifier

  • Average plate current

    1.5 mA

    PulsedRectifier

Characteristic

  • Tube voltage drop

    60 V

    PlateCurrent=7mA

Application

  • Application

    High-voltage half-wave pulsed rectifier

    TelevisionFlyback

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Peak Plate Current

    80 mA

    Published in approved target datasheet entry

  • Average Plate Current

    1.5 mA

    Published in approved target datasheet entry

  • Absolute-maximum value

    2.9 V

    Published in approved target datasheet entry

  • Absolute-minimum value

    2.1 V

    Published in approved target datasheet entry

  • Tube Voltage Drop (Approx.), for plate current of

    7 mA

    Published in approved target datasheet entry

  • Tube Voltage Drop (Approx.), for plate current of 7 mA

    60 V

    Published in approved target datasheet entry

Characteristic

  • Statistical value controlled on a lot sampling basis

    0.5 mR/hr

    Published in approved target datasheet entry

  • The dc component must not exceed

    24000 V

    Published in approved target datasheet entry