Tube-number record
LD 2
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LD 2 is a tube type in the TubeDatabase archive (class: Sendetriode). Recorded specifications: brand Telefunken, construction Triode, socket Special / none, maximum plate voltage 800 V, and maximum plate dissipation 12 W. The archive does not yet hold a photographed example of this type.
BrandTelefunken
ClassSendetriode
BaseSpecial / none
Filament12.6 V @ 175 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSeries heating of two tubes permitted. Replacement resistor: 70 Ohms.
Absolute Maximum Ratings
Plate Voltage800 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Ruhepunkt | 175 V | — | — | — | 62.5 mA |
| Static Characteristic | 200 V | 9250 | — | 25 | 30 mA |
| Self-excitation (lambda=1m) | 300 V | — | — | — | 70 mA |
Application Notes
Grid bias recommended via cathode resistor to avoid damage from parasitic oscillations. Pulse duration < 10 microseconds for peak current ratings.
Datasheets
Datasheet: LD2.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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