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Tube-number record

NF 4

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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Normaler Arbeitspunkt200 V—180000040001.6 mA

Datasheets

Datasheet: NF4.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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