Tube-number record
7242
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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
Plate Voltage400 V
Plate Dissipation100 W
Grid 1 Voltage-300 V
Cathode Current900 mA
H-C Voltage300 V
Audio Performance
Key Features
- Reinforced structure
- Ceramic base
- Series regulator
- High transconductance
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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