This 4-channel mixer amplifier was found in an American publication from 1947. The circuit uses counterphase output tubes and a transformer power source.
This circuit was found in an American documentation from the 70s, but it can be implemented with a...
This integrated contains a Class B circuit originally developed to provide 6 W in a car radio...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...