Tube-number record
LV 4
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BrandTELEFUNKEN
ClassGegentaktpentode
BaseSpecial / none
Filament12.6 V @ 0.25 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Phenolic
SectionsDouble Push-Pull
Filament / Heater
Heater NotesIndirekt geheizt
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage300 V
Cathode Current25 mA
H-C Voltage50 V
Audio Performance
Key Features
- Ruggedized for mobile use
- Internal push-pull symmetry
- Low input damping at high frequencies
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF-Empfangsstufen | 250 V | 6900 | 300000 | — | 10 mA |
Application Notes
Broadband amplifier and small transmitter stages. Suitable for wavelengths down to 0.8 meters.
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