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Voltage Radio Detector Converter ·Pentode

6J7G

Glass-envelope sharp-cutoff pentode for detector, RF, and general voltage-amplifier service. High plate resistance provides substantial voltage gain, while manufacturer data also support triode-connected operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7R
Socket code: UX7
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Glass version of the 6J7 sharp-cutoff amplifier/detector pentode.

Socket description

Small 7-contact (0.75-inch pin circle)

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7R
Socket code: UX7
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7R - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1SH	A	SH — Internal Shield EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN2H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN3P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN4G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN5G3	A	G3 — Suppressor Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN8K	A	K — Cathode EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
CAP1G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.00123 S
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 0.75 W
Max screen dissipation: 0.1 W

Promoted values mapped from printed rating/approximate-data tables; additional operating points and capacitances retained as parameters.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
250 V
Published datasheet rating
Maximum screen voltage
125 V
Published datasheet rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Screen current
0.8 mA
ClassA

Characteristic

Plate resistance
1000000 ohm
Published datasheet characteristic
Transconductance
1225 µS
Published datasheet characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 02

1946 Amalgamated Wireless

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Output capacitance
0.38 pF
Direct interelectrode capacitance

Data set 03

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Triode-connected operation
Published
TriodeConnection

Data set 04

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Resistance
1500000 ohm
Transconductance
1225 µS

Other

Maximum Plate Voltage
300 V
Maximum Screen Voltage
125 V
Maximum Plate Dissipation
0.75 W
Maximum Screen Dissipation
0.1 W
Plate Voltage
250 V
Pentode connection
Screen Voltage
100 V
Pentode connection

Data set 05

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Grid-All Capacitance
4.7 pF
Anode-All Capacitance
9.9 pF
Anode-Grid Capacitance
0.0038 pF
Typical Anode Voltage
250 V
Typical Screen Voltage
100 V
Typical Grid Bias
-3 V
Triode-Connected Service
1 boolean
Oscillator Service
1 boolean

Data set 06

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
RF amplification

Data set 07

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
300 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
2 mA
ClassA
Screen current
0.5 mA
ClassA

Characteristic

Plate resistance
1000000 ohm
Published handbook characteristic
Transconductance
1225 µS
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 08

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA;PentodeConnection
Screen-grid voltage
100 V
ClassA;PentodeConnection
Control-grid voltage
-3 V
ClassA;PentodeConnection
Plate current
2 mA
ClassA;PentodeConnection
Screen-grid current
0.5 mA
ClassA;PentodeConnection

Characteristics

Transconductance
1250 uS
PentodeConnection
Plate resistance
1500000 Ohm
PentodeConnection
Control-grid cutoff voltage
-7 V
PentodeConnection
Amplification factor
20 ratio
TriodeConnection
Transconductance
1900 uS
TriodeConnection
Plate resistance
100000 Ohm
TriodeConnection

Capacitance

Input capacitance
4.6 pF
PentodeConnection
Output capacitance
12 pF
PentodeConnection

Data set 09

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
250 V
Published operating/characteristic table
Screen Voltage
100 V
Published operating/characteristic table
Grid Voltage
-3 V
Published operating/characteristic table

Characteristic

Plate Current
2 mA
Published operating/characteristic table
Screen Current
0.5 mA
Published operating/characteristic table
Transconductance
1225 uS
Published operating/characteristic table
Plate Resistance
7 ohm
Published operating/characteristic table