This is a photo of an ancient Dressen Barnes power supply from the 1950s. It uses germanium transistors throughout. Some of them are located on the other side of the board, and the only thing that can be seen are the nuts holding them down and the two holes where the leads pass through. Some others are held to the board with fuse clips, presumably so that they can be removed. The wiring was typical of commercial grade equipment for that day. Each component was soldered into the brass studs that were mounted in rows on the board. When the final inspection was done, the inspector painted a red dot of paint on every solder point to tell that it had been checked. The components could be unsoldered to do a repair but the paint would be removed.
2012-03-19 Ancient Dressen Barnes Power Supply
