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Tube Database (7,341 tube types · 1,270 archive entries)

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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode section as HF/IF amplifier100 V1700850000182.8 mA
Pentode section as HF/IF amplifier170 V2000900000185 mA
Pentode section as HF/IF amplifier200 V20001000000185 mA

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

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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