The regenerator allows you to achieve the highest efficiency even from the receiver on one radio tube … so in the early years when lamps were very expensive it was widely used not only in professional but also in amateur and industrial household receivers .. competing very successfully in the 20s with the superheterodyne, also invented by Edwin Armstrong in 1918 Due to its simplicity and efficiency, the Regenerator in the 20s and until the beginning of the 30s became the most popular type of receiver almost all over the world