Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Triode-connected operation
Published
TriodeConnection
Voltage Radio Detector Converter ·Pentode
6J7GT
GT-envelope sharp-cutoff pentode for detector and high-gain voltage-amplifier service. High plate resistance and modest transconductance provide substantial receiver gain, with manufacturer data also supporting triode connection.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7R
- Socket code
- IO
- Base pins
- 7
- Nominal heater
- 6.3 V / 300 mA
Description
GT-envelope detector/amplifier pentode specified as having the same basic characteristics as the 6J7G except interelectrode capacitances.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7R
- Socket code
- IO
- 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
- 300 V
- Max screen voltage
- 125 V
- Max plate dissipation
- 0.75 W
- Max screen dissipation
- 0.1 W
Published maximum ratings, characteristics, operating conditions and capacitances reviewed.
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 02
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
Data set 03
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
RF amplification
Data set 04
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
Triode-connected plate voltage
250 V
TriodeConnection ClassA
Triode-connected control-grid bias
8 V
TriodeConnection ClassA
Triode-connected plate current
6.5 mA
TriodeConnection 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
Triode-connected plate resistance
10500 ohm
TriodeConnection
Triode-connected transconductance
1900 µS
TriodeConnection
Triode-connected amplification factor
20
TriodeConnection
Data set 05
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 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