Tube-number record
7F7
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BrandSylvania
ClassHigh-Mu Duo Triode
BaseLoctal
Filament7 V @ 0.32 mA
Construction
Primary TypeTriode
EnvelopeT9
SectionsDuo
Filament / Heater
Heater NotesTypical Operation also lists 6.3V @ 0.3A
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
H-C Voltage90 V
Audio Performance
Key Features
- High-mu duo triode
- Lock-In construction
- GT Equivalent 6SL7GT
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier Per Section | 100 V | 1125 | 62000 | 70 | 0.65 mA |
| Class A Amplifier Per Section | 250 V | 1600 | 44000 | 70 | 2.3 mA |
Application Notes
Designed for use as a resistance coupled amplifier or phase inverter. All elements except the common heater are brought out separately allowing each triode section to operate independently.
Datasheets
Datasheet: 7F7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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