Tube-number record
HF-PENTODE
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BrandTELEFUNKEN
ClassSmall Signal Pentode
Base6-pin
Filament1.9 V @ 0.5 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide cathode
Absolute Maximum Ratings
Plate Voltage220 V
Plate Dissipation1 W
Grid 2 Voltage140 V
Cathode Current7 mA
H-C Voltage35 V
Audio Performance
Key Features
- Hochfrequenzverstärkung bis zu ca. 1 m Wellenlänge
- Indirekt geheizt
- Serienschaltung nicht möglich
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Normal Operation | 210 V | 1500 | 1500000 | 2000 | 2 mA |
Application Notes
The typical operating point should be set automatically by cathode resistor. If screen grid voltage is supplied via a series resistor, a value of 250 kOhms is recommended.
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