Tube-number record
9AU7
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BrandTUNG-SOL
ClassTWIN TRIODE
BaseNoval (B9A)
Filament9.4 V @ 225 mA
Construction
Primary TypeDual triode
EnvelopeGLASS BULB
Base MaterialSMALL BUTTON NOVAL
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesControlled warm-up characteristics for series heater operation.
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation2.75 W
Cathode Current22 mA
H-C Voltage200 V
Audio Performance
Key Features
- UNIPOTENTIAL CATHODE
- 9 PIN MINIATURE CONSTRUCTION
- CONTROLLED HEATER WARM-UP
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CLASS A1 AMPLIFIER - EACH UNIT | 100 V | 3100 | 6250 | 19.5 | 11.8 mA |
| CLASS A1 AMPLIFIER - EACH UNIT | 250 V | 2200 | 7700 | 17 | 10.5 mA |
Application Notes
Specifically designed for audio frequency amplifier or combined oscillator and mixer applications in 450 MA series heater television receivers.
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