LS50
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BrandTelefunken
ClassPower Pentode
BaseRLM-Norm D 3219
Filament12.6V @ 550mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Ceramic
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide cathode
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation12 W
Grid 2 Voltage400 V
Cathode Current100 mA
H-C Voltage100 V
Audio Performance
Typical THD8%
Power Output8.5 W
Key Features
- Aviation tube (Luftfahrtrohre)
- Pulse operation capability
- High transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| NF-Endverstärker Eintakt-A | 250V | 15000 | - | - | 72mA |
| NF-Endverstärker Gegentakt-AB (300V) | 300V | - | - | - | 60mA |
| HF-Senderverstärker (B-Betrieb) | 600V | - | - | - | - |
Application Notes
For pulse applications, the heater must be switched on for at least 1 minute before applying other voltages.
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