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Rectifier - TV Line Scan Boost ·Rectifier

3BT2

High-voltage vacuum rectifier designed for television flyback and picture-tube power-supply service. Its specialized construction rectifies horizontal-output pulses to produce the elevated accelerating voltage required by the CRT.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
-
Nominal heater
3.15 V / 480 mA

Description

3BT2 is a Rectifier vacuum tube documented in the RCA Receiving Tube Manual. The supplied excerpt was reviewed for heater or filament data, physical section arrangement, maximum ratings, electrical characteristics, capacitances, and stated application.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
-
Nominal heater voltage
3.15 V
Nominal heater current
480 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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
38000 V
Rectifier nominal output current
2.2 mA
Rectifier peak forward current
110 mA
Rectifier forward voltage drop
70 V

Rectifier section; published ratings/characteristics promoted where clearly attributable.

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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Heater Voltage (ac/dc)

    3.15 V

    Heater Voltage (ac/dc) 3.15 volts

  • Heater Current

    480 mA

    Heater Current 0.48 ampere

  • Peak Plate Current

    110 mA

    Peak Plate Current 110 mA

  • Average Plate Current

    2.2 mA

    Average Plate Current 2.2 mA

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

    7 mA

    Tube Voltage Drop (Approx.), for plate current of 7 mA 70 volts

  • Heater Voltage (ac)

    3.6 V

    Heater Voltage (ac) 3.6 volts

  • Heater Current

    225 mA

    Heater Current 0.225 ampere

  • Peak Plate Current

    100 mA

    Peak Plate Current 100 mA

  • Average Plate Current

    2 mA

    Average Plate Current 2 mA

  • Tube Voltage Drop for plate current of

    11 mA

    Tube Voltage Drop for plate current of 11 mA 60 volts

  • Peak inverse plate voltage

    38000 V

    Published rectifier rating

  • Average output/plate current

    2.2 mA

    Published rectifier operating/rating value

Characteristic

  • Heater voltage

    3.15 V

    Rated heater/filament condition

  • Tube voltage drop

    70 V

    Published instantaneous characteristic