Tube-number record
UBF 11
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UBF 11 is a tube type in the TubeDatabase archive (class: Double Diode Pentode). Recorded specifications: brand Philips, construction Pentode, base Metal (Stahlröhre), socket Side-contact (P-base), maximum plate voltage 250 V, and maximum plate dissipation 1.5 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassDouble Diode Pentode
BaseSide-contact (P-base)
Filament20 V @ 100 mA
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 | 250 V | 1800 | 1200000 | 2160 | 5 mA |
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.
Datasheets
Datasheet: UBF11.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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