Tube-number record
NF 4
0 archive entries
NF 4 is a tube type in the TubeDatabase archive (class: HF-Pentode). Recorded specifications: brand Telefunken, construction Pentode, base Metal/Phenolic, socket Special / none, maximum plate voltage 200 V, and maximum plate dissipation 1.5 W. The archive does not yet hold a photographed example of this type.
BrandTelefunken
ClassHF-Pentode
BaseSpecial / none
Filament12.6 V @ 195 mA
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 | 200 V | — | 1800000 | 4000 | 1.6 mA |
Datasheets
Datasheet: NF4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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