Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Plate Voltage
250 V
ClassA
Voltage - Dual Triode (similar) ·Triode-Triode
7F8W
Rugged high-transconductance double triode designed for electronic applications requiring resistance to mechanical shock and vibration while retaining useful amplifier characteristics.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- LOCTAL8
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
A rugged high-transconductance double triode designed for applications requiring resistance to shock and vibration.
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
- -
- 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
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
- Transconductance
- 0.0052 S
- Amplification factor
- 50
- Max plate voltage
- 330 V
- Max plate dissipation
- 3.5 W
Rugged high-transconductance double triode; identical sections compressed.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0052 S
- Amplification factor
- 50
- Max plate voltage
- 330 V
- Max plate dissipation
- 3.5 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.