Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater Voltage
6.3 V
Nominal published value
Heater Current
320 mA
Nominal published value
Voltage - Dual Triode (similar) ·Triode-Triode
7AF7
Medium-mu twin triode with two similar sections for Class-A voltage amplification and phase-inverter service in receiving and general electronic equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 8AC
- Socket code
- LOCTAL8
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
A Lock-In double-triode amplifier with two similar triode sections and separate electrical ratings per section.
Socket description
Loctal 8-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8AC
- Socket code
- LOCTAL8
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8AC - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 7600 Ω
- Transconductance
- 0.0021 S
- Amplification factor
- 16
- Max plate voltage
- 300 V
- Max plate dissipation
- 2.5 W
Promoted from printed maximum/characteristic columns; additional published values are retained in TUBE_SECTION_PARAMETER.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 7600 Ω
- Transconductance
- 0.0021 S
- Amplification factor
- 16
- Max plate voltage
- 300 V
- Max plate dissipation
- 2.5 W
Second physical triode section; added to align rows with SectionCount.
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
Triode
Capacitance
Input capacitance
2.2 pF
EachSection
Output capacitance
1.6 pF
EachSection
Grid-to-plate capacitance
2.3 pF
EachSection
Other
Typical plate voltage
250 V
ClassA;EachSection
Typical grid voltage
-10 V
ClassA;EachSection
Typical plate current
9 mA
ClassA;EachSection
Characteristic
Plate resistance
7600 Ohm
EachSection
Transconductance
2100 uS
EachSection
Amplification factor
16
EachSection