Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This reaper has the signal limit determined by the zener voltage. We found this circuit in a 1980...
This unity gain circuit was found in the February 1995 Electronics Now magazine. The frequency is 10 kHz,...
This reinforcing stages from a 1960s documentation. No information is given about the transformer...