This is one of the first super regenerative tube receiver configurations that we find in technical publications. It was in a 1944 publication and used two tubes. We remind you that the FM band at that time was around 40 MHz.

This is one of the first super regenerative tube receiver configurations that we find in technical publications. It was in a 1944 publication and used two tubes. We remind you that the FM band at that time was around 40 MHz.