LD 2
0 Tubes in archive
BrandTelefunken
ClassSendetriode
BaseSpecial
Filament12.6V @ 175mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSeries heating of two tubes permitted. Replacement resistor: 70 Ohms.
Absolute Maximum Ratings
Plate Voltage800 V
Plate Dissipation12 W
Grid 1 Voltage-300 V
Cathode Current90 mA
H-C Voltage100 V
Audio Performance
Key Features
- Decimeter waves
- Bordbetrieb geeignet
- Self-excitation
- Frequency doubling
- Pulse operation capable
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Ruhepunkt | 175V | - | - | - | 62.5mA |
| Static Characteristic | 200V | 9250 | - | 25 | 30mA |
| Self-excitation (lambda=1m) | 300V | - | - | - | 70mA |
Application Notes
Grid bias recommended via cathode resistor to avoid damage from parasitic oscillations. Pulse duration < 10 microseconds for peak current ratings.
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