Tube-number record
L939
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BrandTELEFUNKEN
ClassTriode
Filament12.6 V @ 4100 mA
Construction
Primary TypeTriode
EnvelopeAir-cooled
Sections1
Filament / Heater
Warm-up Time60s
Heater NotesOne heater lead is internally connected to the cathode.
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation1000 W
Cathode Current1000 mA
Audio Performance
Power Output680 W
Key Features
- Luftgekühlt (Air-cooled)
- Gitterbasisschaltung
- Shortwave transmitter up to 80cm
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Characteristic | 1000 V | 40000 | 1000 | 40 | 300 mA |
| CW Grounded Grid (Fremdsteuerung) | 1500 V | — | — | — | 750 mA |
Application Notes
The tube is suitable for operation in self-excited and separately excited transmitters, predominantly in grounded grid circuits.
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