Tube-number record
4 X.P.
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4 X.P. is a tube type in the TubeDatabase archive (class: Mains Power Output Triode). Recorded specifications: brand Cossor, construction Triode, maximum plate voltage 250 V, and maximum plate dissipation 12 W. The archive does not yet hold a photographed example of this type.
BrandCossor
ClassMains Power Output Triode
Construction
Primary TypeTriode
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation12 W
Audio Performance
Key Features
- Modern super-power valve
- High sensitivity
- High mutual conductance
- Directly heated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Directly Heated Mains Power Output | 250 V | 7000 | 900 | 6.3 | 48 mA |
Application Notes
For large radiogram receivers or amplifiers, two of these valves in push-pull give an output adequate for almost all purposes. A large energised speaker should be used. If automatic bias is used, care must be taken that the resistance across the filament terminals is truly centre tapped to avoid hum.
Datasheets
Datasheet: 4XP.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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