This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This power supply for tube heaters was found in a January 1961 Radio Electronics. The circuit uses...
This preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...
This circuit was suggested by old French documentation, but it can be used as a shield, in which...