7N7
2 Tubes in archive
BrandSylvania
ClassMedium-Mu Duotriode
BaseLock-In 8 Pin
Filament7V @ 640mA
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) | 90V | 3000 | 6700 | 20 | 10mA |
| Class A Amplifier (Condition 2) | 250V | 2600 | 7700 | 20 | 9mA |
| Phase Inverter (100V Supply) | 100V | - | 30000 | - | 1.5mA |
| Phase Inverter (250V Supply) | 250V | - | 50000 | - | 2.4mA |
Application Notes
Designed for use as a phase inverter or voltage amplifier. Identical to two Type 7A4 tubes. Equivalent to octal base 6SN7GT.
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