Tube-number record
SP.22
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BrandMazda
ClassBattery Screened H.F. Pentode
BaseOctal
Construction
Primary TypePentode
EnvelopeMetallised
Base MaterialStandard
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Grid 2 Voltage150 V
Audio Performance
Key Features
- Fixed gain amplifier
- Frequency changer
- Detector
- Battery operated
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Amplifier 1 | 120 V | 900 | 2700000 | — | 5.5 mA |
| H.F. Amplifier 2 | 120 V | 1200 | 1350000 | — | 7 mA |
| H.F. Amplifier 3 | 120 V | 1200 | 1350000 | — | 11 mA |
Application Notes
The metal coating should always be connected to earth to avoid instability. When used as a detector with cumulative grid rectification, a screen voltage of 50-60 is recommended.
Datasheets
Datasheet: SP22.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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