This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455 kHz and is powered by batteries. The push-pull output gives a good audio power.
We found this circuit in a 1998 documentation. The circuit can also be used as a minutery...
The TAA131 used in this circuit is not very easy to find today, but an equivalent low power audio...
These three circuits have different treble responses. We found them in the February 1970 issue of...