We found this circuit in a 1971 documentation. The circuit can be assembled with more modern transistors such as BC548 for Q1, BC558 for Q2 and BD135 for Q3.
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
Found in a 1980s documentation, this circuit uses transistors from that time. Modern equivalents can be...
The SH-205R receiver was sold in the 1960s in Japan. It used two germanium transistors and had a...