LD 9
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BrandTelefunken
ClassTriode
BaseSpecial (Two-part: Lg.Nr. 1806, Lg.Nr. 1825)
Filament12.6V @ 1.1mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
SectionsSingle
Filament / Heater
Warm-up Time60s
Heater NotesOne heater lead is connected to the cathode inside the tube.
Absolute Maximum Ratings
Plate Voltage2500 V
Plate Dissipation300 W
Grid 1 Voltage-200 V
Cathode Current225 mA
Audio Performance
Key Features
- Air-cooled
- Metal-ceramic construction
- Decimeter wave operation
- Frequency doubling capable
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| B-operation (18 cm) | 1500V | 19500 | - | 111.1 | 175mA |
| B-operation (30 cm) | 1700V | 19500 | - | 111.1 | 175mA |
| B-operation (50 cm) | 2000V | 19500 | - | 111.1 | 175mA |
Application Notes
Preferred for use in grid-base circuits. Not suitable for high-keying. Frequency doubling is efficient due to low penetration factor (Durchgriff).
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