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It is not "OA 79" it is "0A79", that is the digit zero not the letter "O".

The designation of 0A79 is inherited from old designation system for Vacuum Tubes.

  • 0 - 0V heater/filament or no heater/filament meaning a Cold Cathode device
  • A - Low Current Diode
  • 79 - an arbitrary unique number identifying the specific device type, in this case a solid state germanium diode not a vacuum diode or gas diode
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