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Tube-number record
7N7
2 archive entries
BrandSylvania
ClassMedium-Mu Duotriode
BaseLoctal
Filament7 V @ 640 mA
Construction
Primary TypeTriode
EnvelopeT-9
Sections2
Filament / Heater
Heater NotesHeater current 640 mA at 7.0 V nominal; 600 mA at 6.3 V typical operation.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
H-C Voltage90 V
Audio Performance
Key Features
- Medium-mu duotriode
- Separate cathodes for each section
- Lock-in base
- Single-ended
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Condition 1) | 90 V | 3000 | 6700 | 20 | 10 mA |
| Class A Amplifier (Condition 2) | 250 V | 2600 | 7700 | 20 | 9 mA |
| Phase Inverter (100V Supply) | 100 V | — | 30000 | — |
Application Notes
Designed for use as a phase inverter or voltage amplifier. Identical to two Type 7A4 tubes. Equivalent to octal base 6SN7GT.
Datasheets
Datasheet: 7N7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
