Tube-number record
7242
0 archive entries
7242 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand MAZDA, construction Triode, base Ceramic, socket 7-pin (non-miniature), maximum plate voltage 400 V, and maximum plate dissipation 100 W. The archive does not yet hold a photographed example of this type.
BrandMAZDA
ClassPower Triode
Base7-pin (non-miniature)
Filament6.3 V @ 7.5 mA
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialCeramic
Sections1
Filament / Heater
Heater NotesSupply voltage should be as close to 6.3V as possible.
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Series Regulator | — | 111000 | — | 9 | — |
Application Notes
Used primarily as a series regulator in stabilized power supplies. Cathode bias is recommended with a resistance of at least 10 Ohms. When using sections in parallel, cathode resistors are indispensable for current balancing. A grid resistor of approximately 1000 Ohms is recommended to prevent parasitic oscillations.
Datasheets
Datasheet: 7242.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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