A g type star of 5800k is cooler than a O star and hotter than m type star.
The problems normally encountered with such circuit is the open air spark gap tending to go out of prefect adjustment due to heating as the gap effecting the magnets density.
Typically use of a gas filledspark gapwith magnetic quenching and it will work for longer but could not be adjusted internally so increasing the power factor to compensate.
It will work long enough for detecting the transmitted wave at a distance twice that of radio waves are capabilities of power range. It only has four times the intensity and powerful buzzer star.
