6BK4
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BrandSYLVANIA
ClassSharp cutoff beam triode voltage regulator
BaseOctal
Filament6.3V @ 200mA
Construction
Primary TypeBeam Triode
EnvelopeT-12
Base MaterialBS 71 Short Jumbo Shell Octal
SectionsSingle
Filament / Heater
Heater NotesHeater positive with respect to cathode not recommended
Absolute Maximum Ratings
Plate Voltage25000 V
Plate Dissipation25 W
Grid 1 Voltage-125 V
Cathode Current1.5 mA
H-C Voltage225 V
Audio Performance
Key Features
- Sharp cutoff
- Low current
- High voltage regulator
- X-ray radiation shielding required above 16kV
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Shunt Voltage Regulator | 25000V | 200 | - | 2000 | 1mA |
Application Notes
X-ray radiation shielding may be necessary to protect against personal injury from prolonged exposure if operated higher than 16,000 volts.
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