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Voltage Radio Detector Converter ·Pentode

6J7

Classic sharp-cutoff three-grid pentode for RF voltage amplification and detector service in radio receivers. High plate resistance provides strong voltage gain, while the accessible suppressor grid permits specialized detector and control circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Sharp-cutoff three-grid amplifier/detector pentode for RF and detector service.

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: 0.001225 S
Max plate voltage: 250 V
Max screen voltage: 100 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.5 W

Pentode connection; triode-connection data parameterized.

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

1935 RCA All Metal Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
Screen voltage
125 V
Grid-plate capacitance
0.005 pF

Characteristic

Grid voltage
-3 V
Plate250V
Plate current
2 mA
Plate250V
Screen current
0.5 mA
Plate250V
Input capacitance
7 pF
Output capacitance
12 pF

Data set 02

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 03

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Transconductance
1225 µS
Published operating characteristic
Amplification factor
1500
Published operating characteristic

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
Plate Current
2 mA
Pentode connection

Data set 05

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 06

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

Data set 07

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Triode-Connection Amplification Factor
20
TriodeConnection
Triode-Connection Transconductance
1800 uS
TriodeConnection