But the name of the inventor of the direct amplification receiver with several cascades before the decoder is unknown to science, Due to the use of one or more stages in front of the detector, the receiver of direct amplification has become much more sensitive than the detector receiver and single-tube Acdion But its main advantage was the ability to provide loudspeaker reception, although this advantage became relevant only at the beginning of commercial radio broadcasting Regenerator Experimenting with increasing the rather low sensitivity of direct amplification receivers … future genius inventor and engineer Erwin Armstrong … while still in college in 1914 created and patented the first regenerator receiver … which dramatically increased the sensitivity and selectivity of the radio receiver Two years later, in 1916, a receiver of the same type was patented by Lee De Forest This led to a 12-year lawsuit that ended in the US Supreme Court in Lee DeForest's favor.