UBF 11
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BrandPhilips
ClassDouble Diode Pentode
BaseY8A
Filament20V @ 100mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal (Stahlröhre)
SectionsTriple (2 diodes, 1 pentode)
Filament / Heater
Heater NotesIndirectly heated, 100mA series heater string
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current10 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable-mu pentode
- Signal detector diodes
- Steel-series base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 250V | 1800 | 1200000 | 2160 | 5mA |
Application Notes
Commonly used in European radio receivers as an IF amplifier and detector. Measurement card instructions focus on setting reject limits based on minimum emission or transconductance.
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