Tube-number record
8D8
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BrandBRIMAR
ClassAmplifier Pentode
BaseNoval (B9A)
Filament6.3 V @ 150 mA
Construction
Primary TypePentode
EnvelopeMiniature
SectionsSingle
Filament / Heater
Heater NotesLow hum construction
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 2 Voltage200 V
Audio Performance
Key Features
- Low microphony
- Very low hum
- Rigid construction
- Thorough screening
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristic | 250 V | 1900 | 2500000 | — | 3 mA |
Application Notes
Specifically designed for use in the early stages of high gain A.F. amplifiers.
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