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Voltage Pentode - Remote Cutoff (single) ·Pentode

6BJ6

Remote-cutoff miniature pentode for gain-controlled RF/IF and wideband amplification, combining high plate resistance with very low feedback capacitance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 150 mA

Description

Miniature remote-cutoff pentode used as an RF amplifier in high-frequency and wide-band applications, featuring high transconductance and very low grid-to-plate capacitance.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN2K	A	K — Cathode EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN3H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN4H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN5P	A	P — Plate (Anode) EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN6G2	A	G2 — Screen Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7G3	A	G3 — Suppressor GridGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7IS	A	IS — Internal ScreenGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1300000 Ω
Transconductance: 0.0036 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 3 W
Max screen dissipation: 0.6 W
Max cathode current: 20 mA

Published ratings and characteristics promoted from approved datasheet.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Resistance
1300000 ohm
Transconductance
3600 µS

Other

Maximum Plate Voltage
330 V
Maximum Screen Voltage
330 V
Maximum Plate Dissipation
3.3 W
Maximum Screen Dissipation
0.65 W

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater Voltage
6.3 V
Heater Current
150 mA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA; OperatingPoint1
Screen voltage
100 V
ClassA; OperatingPoint1
Control-grid bias
1 V
ClassA; OperatingPoint1
Plate current
9.2 mA
ClassA; OperatingPoint1
Screen current
3.3 mA
ClassA; OperatingPoint1
Plate resistance
1300000 ohm
ClassA; OperatingPoint1
Transconductance
3600 uS
ClassA; OperatingPoint1
Plate voltage
100 V
ClassA; OperatingPoint2
Screen voltage
100 V
ClassA; OperatingPoint2
Control-grid bias
1 V
ClassA; OperatingPoint2
Plate current
9 mA
ClassA; OperatingPoint2
Screen current
3.5 mA
ClassA; OperatingPoint2
Plate resistance
250000 ohm
ClassA; OperatingPoint2

Data set 04

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater Voltage
6.3 V

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
250 V
ClassA
Screen Voltage
100 V
ClassA

Characteristic

Plate Current
9.2 mA
ClassA

Capacitance

Grid To Plate Capacitance
0.0035 pF
WithShield

Data set 06

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage maximum
330 V
Screen supply voltage maximum
330 V
Plate dissipation maximum
3.3 W
Screen dissipation maximum
0.65 W
Typical plate voltage
250 V
ClassA
Typical screen voltage
100 V
ClassA

Characteristics

Transconductance
3600 uS
ClassA
Reduced-heater transconductance
2900 uS
Plate resistance
1.3 Mohm
ClassA

Data set 07

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid No.1-to-plate capacitance
0.0035 pF
Grid No.1-to-other-electrodes capacitance
4.5 pF

Other

Plate voltage
100 V
ClassA
Screen-grid voltage
100 V
ClassA;PlateVoltage=100V
Plate resistance
250000 ohm
ClassA;PlateVoltage=100V
Transconductance
3650 uS
ClassA;PlateVoltage=100V
Plate current
9 mA
ClassA;PlateVoltage=100V
Screen-grid current
3.5 mA
ClassA;PlateVoltage=100V
Plate voltage
250 V
ClassA
Screen-grid voltage
100 V
ClassA;PlateVoltage=250V
Plate resistance
1300000 ohm
ClassA;PlateVoltage=250V
Transconductance
3600 uS
ClassA;PlateVoltage=250V
Plate current
9.2 mA
ClassA;PlateVoltage=250V

Data set 08

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Screen Supply Voltage
300 V
Plate Voltage
100 V
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Screen Voltage
100 V
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Grid1 Voltage
-1 V
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Voltage
250 V
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Screen Voltage
100 V
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Grid1 Voltage
-1 V
ClassA; PlateVoltage=250V; ScreenVoltage=100V

Characteristic

Plate Resistance
250000 ohm
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Transconductance
3650 uS
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Current
9 mA
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Screen Current
3.5 mA
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Resistance
1300000 ohm
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Transconductance
3600 uS
ClassA; PlateVoltage=250V; ScreenVoltage=100V

Data set 09

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Nominal
Heater current
150 mA
Nominal
Maximum plate voltage
330 V
Promoted published value
Maximum screen voltage
330 V
Promoted published value
Maximum plate dissipation
3.3 W
Promoted published value
Maximum screen dissipation
0.65 W
Promoted published value
Grid No.l to plate
0.0035 mA
Direct Interelectrode Capacitances:
Heater Voltage
6.3 V
Direct Interelectrode Capacitances:

Characteristic

Plate resistance
1300000 ohm
Promoted published value
Transconductance
3600 uS
Promoted published value
Voltage
20 V
Current at
0.15 V
Plate Supply Voltage
250 V
Direct Interelectrode Capacitances:

Data set 10

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Voltage ac or do
6.3 V
Current
0 mA
PublishedColumn1
Current
15 A
PublishedColumn2

Capacitance

Grid No.l to plate . max. max
0.0035 pF
PublishedColumn1
and heater
4.5 pF
PublishedColumn1
and heater
5.5 pF
PublishedColumn1

Characteristics

Plate -Voltage
100 V
PublishedColumn1
Plate -Voltage
250 V
PublishedColumn2
Grid-No. Voltage
100 V
PublishedColumn1
Grid-No.l Voltage'
-1 V
PublishedColumn1
Plate Resistance (Approx.)
0.25 Mohm
PublishedColumn1
Plate Resistance (Approx.)
1.3 Mohm
PublishedColumn2
Transconductance
3650 µS
PublishedColumn1

Data set 11

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid No.1-to-plate capacitance
0.0035 pF
Grid No.1-to-other-electrodes capacitance
4.5 pF

Other

Plate voltage
100 V
ClassA
Screen-grid voltage
100 V
ClassA;PlateVoltage=100V
Plate resistance
250000 ohm
ClassA;PlateVoltage=100V
Transconductance
3650 uS
ClassA;PlateVoltage=100V
Plate current
9 mA
ClassA;PlateVoltage=100V
Screen-grid current
3.5 mA
ClassA;PlateVoltage=100V
Plate voltage
250 V
ClassA
Screen-grid voltage
100 V
ClassA;PlateVoltage=250V
Plate resistance
1300000 ohm
ClassA;PlateVoltage=250V
Transconductance
3600 uS
ClassA;PlateVoltage=250V
Plate current
9.2 mA
ClassA;PlateVoltage=250V