6BK7
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BrandSylvania
ClassTwin Triode
BaseSmall Button 9-Pin
Filament6.3V @ 450mA
Construction
Primary TypeTwin Triode
EnvelopeT-6 1/2
Sections2
Filament / Heater
Heater NotesUnipotential cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.7 W
H-C Voltage90 V
Audio Performance
Key Features
- Medium-mu twin triode
- Cascode amplifier application
- Internal shielding
- High transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Section 1) | 100V | 6100 | 6100 | 37 | 9mA |
| Class A Amplifier (Section 2) | 150V | 8300 | 4700 | 40 | 18mA |
Application Notes
Shielding between sections minimizes internal capacity coupling. When operated as a cascode amplifier and the two sections are connected in series, the heater-cathode voltage of the grounded grid stage may be as high as 250 volts maximum with the heater negative with respect to the cathode.
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