Tube-number record
UBC81
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UBC81 is a tube type in the TubeDatabase archive (class: Double Diode-Triode). Recorded specifications: brand Philips, construction Multi-section, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 0.5 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassDouble Diode-Triode
BaseNoval (B9A)
Filament14 V @ 100 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
SectionsTriode and two diodes
Filament / Heater
Heater NotesIndirect by A.C. or D.C. series supply
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 170 V | 1650 | 42000 | 70 | 1.5 mA |
| Triode section | 100 V | 1400 | 50000 | 70 | 0.8 mA |
Application Notes
Can be used without special precautions against microphonic effect in circuits in which input voltage Vi >= 10 mV for an output of 50 mW of the output tube.
Datasheets
Datasheet: UBC81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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