LD 5
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BrandTelefunken
ClassSendetriode
BaseSpecial (Lg.-Nr. 1749)
Filament12.6V @ 0.24mA
Construction
Primary TypeTriode
SectionsSingle
Filament / Heater
Heater NotesSeries heating of two tubes permissible. A resistor of 53 Ohms + 5% can be used as a replacement.
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation25 W
Grid 1 Voltage-200 V
Cathode Current100 mA
Audio Performance
Key Features
- Decimeter wave operation down to 35 cm
- Self-excitation and pulse capabilities
- Air cooling required at full load
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CW Self-excited (35 cm) | 300V | 12000 | - | 15.4 | 100mA |
| CW Self-excited (40 cm) | 430V | 12000 | - | - | 100mA |
| CW Driven (>2 m) | 500V | 12000 | - | - | 100mA |
Application Notes
Temp of bulb must not exceed 300C; socket cap must stay below 140C. Forced air cooling required in closed housings.
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