Tube-number record
NF 3
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BrandTelefunken
ClassRegelpentode
BaseSide-contact (P-base)
Filament12.6 V @ 195 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Side-contact
SectionsSingle
Filament / Heater
Heater NotesSerienschaltung zum Betrieb aus 25-Volt Starterbatterien zugelassen
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation1.5 W
Grid 2 Voltage125 V
Cathode Current8 mA
H-C Voltage125 V
Audio Performance
Key Features
- Variable-mu (Regelpentode)
- Indirectly heated
- Low grid-to-plate capacitance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Characteristics | 200 V | 2300 | 700000 | — | 4.5 mA |
Application Notes
Designed for radio frequency stages and operation from 25V battery systems.
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