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Voltage Radio Detector Converter ·Heptode

3BE6

Pentagrid oscillator-converter electrically related to the 6BE6, combining local-oscillator and mixer functions for superheterodyne receiving service with a controlled-warm-up series-string heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CH
Socket code: B7G
Base pins: 7
Nominal heater: 3.15 V / 600 mA

Description

3BE6 is described in the supplied Tung-Sol datasheet as a controlled-warm-up converter heptode equivalent to 6BE6. Published electrical ratings and operating characteristics were extracted from the supplied source.

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: 3.15 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CH - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2G5	A	G5 — Fifth GridGroup 7CH2 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2K	A	K — 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
PIN5P	A	P — Plate (Anode) Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G2	A	G2 — Screen GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G4	A	G4 — Fourth GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN7G3	A	G3 — 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
Rectifier warm-up time: 11 s

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate voltage
250 V
Converter
Screen-grid voltage
100 V
Converter
Grid bias
1.5 V
Converter
Plate current
2.9 mA
Converter
Screen-grid current
6.8 mA
Converter
Plate resistance
1000000 ohm
Converter
Conversion transconductance
475 uS
Converter
Oscillator grid current
0.5 mA
Converter
Oscillator grid resistor
20000 ohm
Converter

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Warmup Time
11 s

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Voltage
3.15 V
Heater Current
600 mA
ControlledWarmupHeater
1 boolean
Heater Warmup Time
11 s
Oscillator Plate Voltage
100 V
Oscillator
Oscillator Amplification Factor
20
MixerOutputCapacitance
13 pF

Other

Plate Voltage Maximum
300 V
Grids2And4VoltageMaximum
150 V
Plate Dissipation Maximum
1.7 W
Grids2And4DissipationMaximum
1 W
Plate Voltage
250 V
Converter
Grids2 And4 Voltage
100 V
Converter
Grid3 Voltage
-1.5 V
Converter
Plate Current
3 mA
Converter
Grids2 And4 Current
6.5 mA
Converter
Conversion Transconductance
475 uS
Converter

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater voltage
3.15 V
Published heater rating
Heater current
600 mA
Published heater rating
Conversion transconductance
475 µS
Converter

Other

Maximum plate voltage
300 V
Converter
Maximum grids 2 and 4 voltage
100 V
Converter
Maximum grids 2 and 4 supply voltage
300 V
Converter
Plate voltage
250 V
Converter
Screen voltage
100 V
Converter
Plate current
2.9 mA
Converter

Data set 05

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