Tube-number record
8AU8/8AU8A
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BrandTUNG-SOL
ClassTriode Pentode
BaseNoval (B9A)
Filament8.4 V @ 450 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesAC or DC, Series heater operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage300 V
Grid 1 Voltage6 V
H-C Voltage200 V
Audio Performance
Key Features
- Sharp-cutoff pentode
- Medium-mu triode
- Controlled heater warm-up
- Series heater string operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode Section | 200 V | 7000 | 150000 | — | 15 mA |
| Class A Triode Section | 150 V | 4900 | 8200 | 40 | 9 mA |
Application Notes
Designed for 450 mA series heater monochrome and color television receivers. Pentode section suited for video, video IF, and sound IF amplifiers. Triode section intended for sync amplifiers, separators, clippers, or sweep oscillators.
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