EL90
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ClassNF-Endverstärkung Pentode
Base7-pin Miniature (Heptal)
Filament6.3V @ 0.45mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesParallel feeding; Indirectly heated cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation12 W
Grid 2 Voltage300 V
Grid 1 Voltage-100 V
Cathode Current55 mA
H-C Voltage90 V
Audio Performance
Typical THD10%
Power Output4.5 W
Key Features
- Indirekt geheizt
- Oxydkatode
- NF-Endstufe
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250V | 4100 | 52000 | - | 45mA |
| Triode | 250V | 4500 | - | - | 49.5mA |
Application Notes
Die Steuergitteranschlüsse 1 - 1 an der Fassung müssen beide mit der Steuergitterleitung verbunden werden. Der Heizerstift 2 soll vorzugsweise geerdet werden.
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