UBC81
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BrandPhilips
ClassDouble Diode-Triode
BaseNoval
Filament14V @ 100mA
Construction
Primary TypeDouble Diode-Triode
EnvelopeGlass
SectionsTriode and two diodes
Filament / Heater
Heater NotesIndirect by A.C. or D.C. series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation0.5 W
Grid 1 Voltage-1.3 V
Cathode Current5 mA
H-C Voltage100 V
Audio Performance
Power Output50 W
Key Features
- A.F. amplification
- Signal detection
- A.V.C.
- Low microphonic effect
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 170V | 1650 | 42000 | 70 | 1.5mA |
| Triode section | 100V | 1400 | 50000 | 70 | 0.8mA |
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.
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