Tube-number record
UL 41
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BrandPhilips
ClassOutput Pentode
BaseRimlock
Filament45 V @ 100 mA
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirect; series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation9 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current75 mA
H-C Voltage150 V
Audio Performance
Typical THD10%
Power Output4.25 W
Key Features
- Indirectly heated
- Series supply
- Rimlock base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 100 V | 8000 | 18000 | 10 | 29 mA |
| Class A | 110 V | 8500 | 18000 | 10 | 32 mA |
| Class A | 170 V | 9500 | 20000 | 10 | 53 mA |
Datasheets
Datasheet: UL41.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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