6BK8
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BrandAmalgamated Wireless Valve Co., Ltd.
ClassMiniature A.F. Pentode
Base9-pin Miniature (Noval)
Filament6.3V @ 200mA
Construction
Primary TypePentode
EnvelopeT6.5
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage300 V
Grid 2 Voltage200 V
Cathode Current6 mA
H-C Voltage150 V
Audio Performance
Key Features
- Low noise
- Internally screened
- Microphony suitable for first stage high gain amplifiers
- Any mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 250V | 1850 | 2000000 | - | 3mA |
| Typical Operation A | 175V | - | - | 180 | 0.6mA |
| Typical Operation B | 175V | - | - | 110 | 1.2mA |
Application Notes
Total hum voltage referred to the grid will not exceed 1.5uV when used with a 470K grid resistor. AC heater center-tap recommended.
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