NF 4
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BrandTelefunken
ClassHF-Pentode
BaseBM-Sockel
Filament12.6V @ 195mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Phenolic
SectionsSingle
Filament / Heater
Heater NotesIndirekt geheizt; Serienschaltung von 2 Rohren aus 25 Volt Starterbatterien zulässig.
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation1.5 W
Grid 2 Voltage150 V
Cathode Current6 mA
H-C Voltage100 V
Audio Performance
Key Features
- Indirekt geheizt
- HF-Pentode
- Low noise
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Normaler Arbeitspunkt | 200V | - | 1800000 | 4000 | 1.6mA |
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