Tube-number record
UL 84
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UL 84 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Philips, construction Pentode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 12 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassOutput Pentode
BaseNoval (B9A)
Filament45 V @ 100 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating, series supply
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 100 V | 9000 | 23000 | 8 | 43 mA |
| Class A | 170 V | 11000 | 26000 | 8 | 70 mA |
| Class B (Two Tubes) | 170 V | — | — | — | 115 mA |
Application Notes
Commonly used in transformerless (series-string) audio output stages and single-ended or push-pull configurations.
Datasheets
Datasheet: UL84.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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