Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Heater Voltage
7 V
Nominal published value
Heater Current
320 mA
Nominal published value
Voltage Pentode - Sharp Cutoff (single) ·Pentode
7AJ7
Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 8V
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
A sharp-cutoff RF pentode with Lock-In base for radio-frequency amplifier service.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8V
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8V - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN2P | A | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN3G2 | A | G2 — Screen Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN4G3 | A | G3 — Suppressor Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN5IS | A | IS — Internal Screen EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN6G1 | A | G1 — Control Grid EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN7K | A | K — Cathode EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN8H | — | H — Heater EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 1000000 Ω
- Transconductance
- 0.002275 S
- Max plate voltage
- 300 V
- Max screen voltage
- 100 V
- Max plate dissipation
- 1 W
Promoted from printed maximum/characteristic columns; additional published values are retained in TUBE_SECTION_PARAMETER.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Input capacitance
6 pF
Section1
Output capacitance
6.5 pF
Section1
Grid-to-plate capacitance
0.007 pF
Section1
Other
Typical plate voltage
100 V
ClassA
Typical screen voltage
100 V
ClassA
Typical grid voltage
-1 V
ClassA
Typical plate current
5.7 mA
ClassA
Typical screen current
1.8 mA
ClassA
Typical plate voltage
250 V
ClassA
Typical screen voltage
100 V
ClassA
Typical grid voltage
-3 V
ClassA
Typical plate current
2.2 mA
ClassA
Typical screen current
0.7 mA
ClassA
Characteristic
Plate resistance
400000 Ohm
100VPlate
Transconductance
2275 uS
100VPlate
Plate resistance
1000000 Ohm
250VPlate
Transconductance
1575 uS
250VPlate