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Rectifier - TV Line Scan Boost ·Rectifier

3CU3A

Fast-warm-up high-voltage pulsed rectifier for television high-voltage service. Its heater-cathode construction is designed for rapid operation in flyback-derived CRT accelerating-voltage supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8MK
Socket code
IO
Base pins
6
Nominal heater
3.15 V / 280 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
8MK
Socket code
IO
Base pins
6
Nominal heater voltage
3.15 V
Nominal heater current
280 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8MK - 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
33000 V
Rectifier nominal output current
2.2 mA
Rectifier peak forward current
100 mA
Rectifier forward voltage drop
50 V

Published section ratings promoted where explicitly available; additional source values retained in parameter rows.

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

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

  • Controlled for X-Radiation — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Controlled for X-Radiation — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Controlled for X-Radiation — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage, ac or do — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage, ac or do — published value 2

    3.15 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage, ac or do — published value 3

    0.5 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Current at Ef = 3.15 V — published value 1

    3.15 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Current at Ef = 3.15 V — published value 2

    0.28 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Direct Interelectrode Capacitance:a

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Instantaneous Tube Voltage — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Instantaneous Tube Voltage — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Plate Current (ib) = 7 mA — published value 1

    7 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Plate Current (ib) = 7 mA — published value 2

    50 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Type of Cathode — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Type of Cathode — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Type of Cathode — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Inverse Plate Voltaged

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute min.) — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute min.) — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute min.) — published value 3

    2.65 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • a Measured without external shield in accordance with the current — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • a Measured without external shield in accordance with the current — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • b As defined in the current issue of EIA Standazd RS-239A — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • b As defined in the current issue of EIA Standazd RS-239A — published value 2

    -239

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • d This rating is applicable when the duration of the voltage pulse — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • d This rating is applicable when the duration of the voltage pulse — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • d This rating is applicable when the duration of the voltage pulse — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • points at or near filament potential. Otherwise, do not use — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • points at or near filament potential. Otherwise, do not use — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • points at or near filament potential. Otherwise, do not use — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Measurement of Filament Voltage. It is recommended that a — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Measurement of Filament Voltage. It is recommended that a — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Measurement of Filament Voltage. It is recommended that a — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • thermocouple rms voltmeter be used to measure filament — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • thermocouple rms voltmeter be used to measure filament — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • thermocouple rms voltmeter be used to measure filament — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage. The meter and its leads must be insulated to — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage. The meter and its leads must be insulated to — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • circuit during this measurement, stray capacitances to ground — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • circuit during this measurement, stray capacitances to ground — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation Characteristic

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • changes in the X-radiation characteristic of the tube. Equip — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • changes in the X-radiation characteristic of the tube. Equip — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation from Receiving Tubes", and controlled in — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation from Receiving Tubes", and controlled in — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation from Receiving Tubes", and controlled in — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • mended Practice for Quality Control of X-Radiation Emitted — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • mended Practice for Quality Control of X-Radiation Emitted — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • mended Practice for Quality Control of X-Radiation Emitted — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • from High Voltage Rectifier and Shunt Regulator Receiving — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • from High Voltage Rectifier and Shunt Regulator Receiving — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • from High Voltage Rectifier and Shunt Regulator Receiving — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages associated with the 3CU3A result in — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages associated with the 3CU3A result in — published value 2

    3 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages associated with the 3CU3A result in — published value 3

    3 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • production of X-Radiation which may constitute a health — published value 1

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • production of X-Radiation which may constitute a health — published value 2

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • production of X-Radiation which may constitute a health — published value 3

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage is adjusted to the recommended value and that any — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage is adjusted to the recommended value and that any — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage is adjusted to the recommended value and that any — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages at which the 3CU3A is operated can be — published value 1

    3 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages at which the 3CU3A is operated can be — published value 2

    3 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • The high voltages at which the 3CU3A is operated can be — published value 3

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • adjustment of, any high voltage circuit — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • adjustment of, any high voltage circuit — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage output terminal is properly grounded while inserting — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage output terminal is properly grounded while inserting — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • voltage output terminal is properly grounded while inserting — published value 3

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Pin 2 -Filament

    2

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Pin 7 -Filament

    7

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Instantaneous tube voltage drop

    50 V

    Explicitly published rectifier rating/characteristic.

Other

  • MAXIMUM RATINGSb —High Voltage Rectifier

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute max.) — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute max.) — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Filament Voltage (absolute max.) — published value 3

    3.65 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation, Maximum — published value 1

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • X-Radiation, Maximum — published value 2

    25 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Peak inverse plate voltage

    33000 V

    Explicitly published rectifier rating/characteristic.

  • Peak plate current

    100 mA

    Explicitly published rectifier rating/characteristic.

  • Average plate current

    2.2 mA

    Explicitly published rectifier rating/characteristic.