7AU7
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BrandTung-Sol
ClassTwin Triode
Base9 Pin Miniature Noval
Filament7V @ 300mA
Construction
Primary TypeTwin Triode
EnvelopeT-6 1/2 Glass
Base MaterialSmall Button Noval 9 Pin
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesControlled warm-up for 600 mA series strings.
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation2.75 W
Cathode Current22 mA
H-C Voltage200 V
Audio Performance
Key Features
- Controlled heater warm-up
- Twin independent triodes
- Low microphonics
- Miniature size
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 3100 | 6250 | 19.5 | 11.8mA |
| Class A1 Amplifier | 250V | 2200 | 7700 | 17 | 10.5mA |
Application Notes
Specifically designed for audio frequency amplifier or combined oscillator and mixer applications in TV receivers with 600 mA series heater strings.
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