Tube-number record
SP.2220
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SP.2220 is a tube type in the TubeDatabase archive (class: A.C./D.C. MAINS H.F. PENTODE). Recorded specifications: brand Mazda, construction Pentode, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassA.C./D.C. MAINS H.F. PENTODE
Base7-pin (non-miniature)
Filament22 V @ 200 mA
Construction
Primary TypePentode
SectionsSingle
Filament / Heater
Heater NotesA.C./D.C. Mains
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Noise suppression
- Automatic tuning circuits
- Variable gain via G3
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Noise Suppression (G3 = -20V) | 250 V | 2650 | — | — | 4.9 mA |
| Automatic Tuning (G3 = -4.3V) | 250 V | 1450 | — | — | 2.9 mA |
Application Notes
The gain available for an input on G1 can be reduced to zero by applying 15 volts negative to the grid G3. In noise suppression, G3 is initially biased to -15 to -20V. An anode resistance of 10,000 to 20,000 ohms is recommended for L.F. amplification.
Datasheets
Datasheet: SP2220.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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