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Voltage - Triode (single high frequency) ·Triode

3BN4A

Medium-mu miniature triode used as an RF amplifier in grid-drive VHF television tuner circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7EG
Socket code
B7G
Base pins
7
Nominal heater
3.15 V / 600 mA

Description

Medium-mu miniature triode used as an RF amplifier in grid-drive VHF television tuner circuits.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7EG
Socket code
B7G
Base pins
7
Nominal heater voltage
3.15 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7EG - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1KAK — Cathode

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN2G1AG1 — Control Grid

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN3H—H — Heater

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN4H—H — Heater

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN5PAP — Plate (Anode)

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN6KAK — Cathode

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

PIN7G1AG1 — Control Grid

Chart transcription; independent verification pending

Unverified

EIA Base Connections, printed page 129, 7EG

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
6000 Ω
Transconductance
0.008 S
Amplification factor
48
Max plate voltage
275 V
Max plate dissipation
2.2 W
Max cathode current
22 mA
Rectifier warm-up time
11 s

Published ratings/characteristics promoted where semantically applicable; supplemental values retained in parameter table.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum Cathode Current

    22 mA

Capacitance

  • Heater To Cathode Capacitance

    2.8 pF

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    3 V

  • Heater Current

    450 mA

  • ControlledWarmupHeater

    1 boolean

  • Heater Warmup Time

    11 s

  • Grid To Plate Capacitance

    1.2 pF

  • Input Capacitance

    3.2 pF

  • Output Capacitance

    1.4 pF

  • Plate Resistance

    6000 ohm

  • Transconductance

    8000 uS

  • Amplification Factor

    48

  • Application

    VHF grounded-grid RF amplifier

Other

  • Plate Voltage Maximum

    275 V

  • Plate Dissipation Maximum

    2.2 W

  • Cathode Current Maximum

    22 mA

  • GridCircuitResistanceMaximum

    0.5 Mohm

  • Plate Voltage

    150 V

    GroundedGridRF

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater voltage

    3.15 V

    Published heater rating

  • Heater current

    600 mA

    Published heater rating

Capacitance

  • Grid-to-plate capacitance

    1.2 pF

    WithExternalShield

  • Input capacitance

    3.2 pF

    WithExternalShield

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Current — published value 1

    0

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

  • Current — published value 2

    600

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

  • Current — published value 3

    0.04

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

  • Voltage (AC or Ix) at heater — published value 1

    0

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

  • Voltage (AC or Ix) at heater — published value 2

    0

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

  • Voltage (ac or dc) at 0.600 A — published value 1

    0 V

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

  • Voltage (ac or dc) at 0.600 A — published value 2

    0.6 V

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

  • Voltage (ac or dc) at 0.600 A — published value 3

    3.15 V

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

  • Warm-up Time (Average)

    11

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

  • Voltage (ac or dc) at 0.450 A — published value 1

    0 V

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

  • Voltage (ac or dc) at 0.450 A — published value 2

    0.45 V

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

  • Voltage (ac or dc) at 0.450 A — published value 3

    3 V

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

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heat Voltage (ac/dc) 2.35 3

    6.3 V

    Heat Voltage (ac/dc) 2.35 3 6.3 volts

  • Heater Current 0.6 0.45

    200 mA

    Heater Current 0.6 0.45 0.2 ampere

  • Plate Voltage

    275 V

    Plate Voltage 275 volts

  • Grid Voltage, Positive-bias value

    0 V

    Grid Voltage, Positive-bias value 0 volts

  • Plate-Supply Voltage

    330 V

    Plate-Supply Voltage 330 volts

  • Grid-No.2 Voltage

    110 V

    Grid-No.2 Voltage 110 volts

  • Grid-No. 1 Voltage, Positive peak value

    60 V

    Grid-No. 1 Voltage, Positive peak value 60 volts

  • Cathode Current

    13 mA

    Cathode Current 13 mA

  • Maximum plate voltage

    275 V

    Published maximum rating

  • Maximum screen-grid voltage

    110 V

    Published maximum rating

Characteristic

  • Plate-Supply Voltage

    150 V

    Plate-Supply Voltage 150 volts

  • Plate Resistance (Approx.)

    5400 ohm

    Plate Resistance (Approx.) 5400 ohms

  • Plate Current

    9 mA

    Plate Current 9 mA

  • Grid-Circuit Resistance

    0.5 Mohm

    Grid-Circuit Resistance 0.5 megohm

  • Heater Voltage (ac/dc) 3.15 4.2 6.3

    12.6 V

    Heater Voltage (ac/dc) 3.15 4.2 6.3 12.6 volts

  • Heater Current 0.6 0.45 0.3

    150 mA

    Heater Current 0.6 0.45 0.3 0.15 ampere

  • Plate resistance

    5400 ohm

    Published section characteristic

  • Amplification factor

    43

    Published section characteristic