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

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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