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Rectifier - TV Line Scan Boost ·Rectifier

3CN3B

High-voltage television flyback rectifier designed to convert horizontal-output transformer pulses into the DC supply used for picture-tube acceleration. Its function is dedicated EHT generation rather than ordinary power-supply rectification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8MU
Socket code
IO
Base pins
8
Nominal heater
3.15 V / 480 mA

Description

A vacuum rectifier documented for television or power-supply service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8MU
Socket code
IO
Base pins
8
Nominal heater voltage
3.15 V
Nominal heater current
480 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8MU - 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
60 V

Promoted from printed flyback-rectifier maximum ratings and average characteristics.

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

  • Peak inverse voltage, DC component

    30000 V

    FlybackRectifierService

  • Heater voltage absolute maximum

    3.65 V

  • Heater voltage absolute minimum

    2.65 V

  • X-radiation output maximum

    25 mR/hr

    At published maximum-rated operating conditions

Capacitance

  • Plate to heater/cathode/internal shield capacitance

    1.6 pF

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Heater absolute maximum voltage

    3.65 V

    FlybackRectifier

  • Heater absolute minimum voltage

    2.65 V

    FlybackRectifier

Characteristic

  • X-radiation maximum

    25 mR/hr

    LotSamplingBasis