Tube-number record
6FH8
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BrandTUNG-SOL
ClassTRIODE TETRODE
BaseNoval (B9A)
Filament6.3 V @ 0.45 mA
Construction
Primary TypeTetrode
EnvelopeT6 1/2 Glass
Base MaterialGlass Small-Button
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage275 V
Plate Dissipation2.3 W
Grid 2 Voltage275 V
Grid 1 Voltage-40 V
Audio Performance
Key Features
- Medium-mu Triode
- Sharp cutoff Tetrode
- Three plates in tetrode unit
- Designed for harmonic-generator applications
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Unit - Class A1 Amplifier | 100 V | 5400 | 7400 | 40 | 7.9 mA |
| Tetrode Unit - Class A1 Amplifier | 250 V | 4400 | 750000 | — | 7.3 mA |
| Harmonic-Generator Service | 100 V | 2500 | — | — |
Application Notes
The tetrode unit employs three plates specifically for harmonic generation.
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