This 4-channel mixer amplifier was found in an American publication from 1947. The circuit uses counterphase output tubes and a transformer power source.
n be assembled with BC558 transistors for low power transistors and a BD136 for the output. The...
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...