Tube-number record
UAF 42
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BrandPhilips
ClassDiode-Pentode
BaseRimlock
Filament12.6 V @ 0.1 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
SectionsDouble
Filament / Heater
Heater NotesIndirect heating, series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current10 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable mutual conductance
- Indirectly heated
- Suitable for RF, IF, or AF amplification
- Internal diode section for detection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode section as HF/IF amplifier | 100 V | 1700 | 850000 | 18 | 2.8 mA |
| Pentode section as HF/IF amplifier | 170 V | 2000 | 900000 | 18 | 5 mA |
| Pentode section as HF/IF amplifier | 200 V | 2000 | 1000000 | 18 |
Application Notes
Can be used without special precautions against microphonic effect in circuits where input voltage is greater than or equal to 10mV for 50mW output.
Datasheets
Datasheet: UAF42.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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