Tube-number record
6HF8
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BrandTUNG-SOL
ClassTriode Pentode
BaseNoval (B9A)
Filament6.3 V @ 0.75 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall-button Noval
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation5 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- High-mu triode
- Sharp-cutoff pentode
- Unipotential cathode
- Miniature construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 200 V | 4000 | 17500 | 70 | 4 mA |
| Pentode Section | 200 V | 12500 | 75000 | — | 25 mA |
| Pentode Section (Low Voltage) | 45 V | — | — | — | 40 mA |
Application Notes
Intended for use in color and black-and-white television receivers. Pentode unit is especially useful as a video output amplifier; triode unit is useful in voltage-amplifier applications such as sync-separator, sync-clipper and phase-inverter circuits.
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