This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz....
This amplifier for public address was found in English documentation from 1967. The transistors are from...
This high selectivity circuit for single tone decoding was found in 1970s documentation. The coil...