8BQ5
0 Tubes in archive
BrandTUNG-SOL
ClassOutput Pentode
BaseSmall Button 9-Pin
Filament8V @ 0.6mA
Construction
Primary TypePentode
EnvelopeGlass Bulb
Sections1
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation12 W
Grid 2 Voltage400 V
Cathode Current65 mA
H-C Voltage100 V
Audio Performance
Typical THD10%
Power Output5.7 W
Key Features
- Coated Unipotential Cathode
- Any Mounting Position
- Designed for Hi-Fi Amplifiers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 250V | 11300 | 40000 | 19.5 | 48mA |
| Class AB Push-Pull (Two Tubes) | 300V | - | - | - | 36mA |
| Class A Triode Operation | 250V | - | - | - | 44mA |
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