Tube-number record
SP.181
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SP.181 is a tube type in the TubeDatabase archive (class: RF Pentode). Recorded specifications: brand Ediswan Mazda, construction Pentode, socket Octal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandEdiswan Mazda
ClassRF Pentode
BaseOctal
Filament18 V @ 200 mA
Construction
Primary TypePentode
EnvelopeSmall, Metallised
SectionsSingle
Filament / Heater
Heater NotesA.C./D.C. Mains
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Screened H.F. Pentode
- Low input loss at high frequencies
- Short Wave A.C./D.C. receivers
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 175 V | 7600 | — | — | 6.3 mA |
| Typical Operation 2 | 200 V | 8500 | — | — | 8.5 mA |
| Typical Operation 3 | 200 V | 8500 | — | — | 10.9 mA |
Application Notes
Input loss at high frequencies reduced to a minimum. Input capacity change (4 pF) can be reduced by biasing back the suppressor grid in addition to the control grid.
Datasheets
Datasheet: SP181.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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