Tube-number record
LB20
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BrandFernseh GmbH
ClassCathode Ray Tube
BaseSpecial / none
Filament12.6 V @ 60 mA
Construction
Primary TypeOther / special
EnvelopeMetal-coated glass
Base MaterialMetal
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage12000 V
Grid 1 Voltage-350 V
Cathode Current0.1 mA
Audio Performance
Key Features
- Luftwaffenrohre
- Metallic outer coating
- Indirekt geheizte Oxide-Kathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard operation | 12000 V | — | — | — | 0.05 mA |
Application Notes
The metallic outer coating should be grounded and can be used as a smoothing capacitor for the anode voltage.
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