Tube-number record
RS 249
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BrandTelefunken
ClassUltrakurzwellen-Triode
BaseSide-contact (P-base)
Filament12.6 V @ 500 mA
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialPlastic
Sectionssingle
Filament / Heater
Heater NotesHeater voltage reduced to 11.5V for operation at wavelengths < 3m
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation13 W
Audio Performance
Power Output12 W
Key Features
- Oxide-coated indirectly heated cathode
- Designed for ultra-shortwave (UKW) applications
- Low-inductance top-bulb connections for Anode, Grid, and Cathode
- Wavelength capability down to 1.5m
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Oscillator/Amplifier | 600 V | 3600 | 5555 | 20 | 40 mA |
Application Notes
Anode, grid, and cathode leads are brought out through the top of the glass bulb to minimize lead inductance. Use flexible leads for these connections to avoid mechanical stress on the glass.
Datasheets
Datasheet: RS249.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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