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Voltage Radio Detector Converter ·Heptode

4BE6

Pentagrid oscillator-converter for superheterodyne receivers, combining local-oscillator and mixer functions for standard broadcast and FM service. Its controlled-warm-up heater is intended for series-string receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7CH
Socket code
B7G
Base pins
7
Nominal heater
4.2 V / 450 mA

Description

The 4BE6 is a miniature heptode designed to perform the combined mixer and oscillator functions in superheterodyne circuits in both standard broadcast and FM bands, with high conversion gain and good oscillator stability under AVC-bias variation.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7CH
Socket code
B7G
Base pins
7
Nominal heater voltage
4.2 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7CH - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN2G5AG5 — Fifth GridGroup 7CH2

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN2KAK — CathodeGroup 7CH2

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN3H—H — Heater

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN4H—H — Heater

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN5PAP — Plate (Anode)

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN6G2AG2 — Screen GridGroup 7CH6

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN6G4AG4 — Fourth GridGroup 7CH6

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

PIN7G3AG3 — Suppressor Grid

Chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CH

Section ratings

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Max plate voltage
300 V
Max screen voltage
100 V
Max plate dissipation
1 W
Max screen dissipation
1 W
Max cathode current
14 mA

Published converter characteristic is conversion transconductance, preserved as a parameter rather than promoted as generic transconductance.

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

Heptode

Other

  • Screen Supply Voltage

    300 V

  • Plate Voltage

    100 V

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Screen Voltage

    100 V

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Grid3 Voltage

    -1.5 V

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Grid1VoltageRMS

    10 V

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Grid1 Resistance

    20000 ohm

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Voltage

    250 V

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Screen Voltage

    100 V

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Grid3 Voltage

    -1.5 V

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Grid1VoltageRMS

    10 V

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Grid1 Resistance

    20000 ohm

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Heater Warmup Time

    11 s

Characteristic

  • Plate Resistance

    400000 ohm

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Conversion Transconductance

    455 uS

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Current

    2.6 mA

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Screen Current

    7 mA

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Cathode Current

    10.1 mA

    ConverterService; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Resistance

    1000000 ohm

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Conversion Transconductance

    475 uS

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Plate Current

    2.9 mA

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Screen Current

    6.8 mA

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Cathode Current

    10.2 mA

    ConverterService; PlateVoltage=250V; ScreenVoltage=100V

  • Oscillator Transconductance

    7250 uS

    OscillatorNotOscillating

Capacitance

  • Grid3ToAllCapacitance

    7 pF

    WithExternalShield

  • Plate To All Capacitance

    13 pF

    WithExternalShield

  • Grid1 To All Capacitance

    55 pF

    WithExternalShield

  • CathodeToAllExceptGrid1Capacitance

    20 pF

    WithExternalShield

  • Grid3ToPlateCapacitanceMaximum

    0.25 pF

    WithExternalShield

  • Grid1ToGrid3CapacitanceMaximum

    0.15 pF

    WithExternalShield

  • Grid1ToPlateCapacitanceMaximum

    0.05 pF

    WithExternalShield

  • Grid1ToCathodeCapacitance

    3 pF

    WithExternalShield