Tube-number record
B240
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BrandPhilips Miniwatt
ClassDuotriode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsDouble
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Audio Performance
Typical THD6%
Power Output1.25 W
Key Features
- Zero-bias class B operation
- Low heater current
- Proportional current consumption
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B | 150 V | — | — | — | 8 mA |
| Class B | 120 V | — | — | — | 4.5 mA |
Application Notes
Requires driver stage (e.g. B217) via transformer with 3:(1+1) ratio. Not suitable for resistance coupling due to grid current.
Datasheets
Datasheet: B240.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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