6SA7 oscillator (T422E)

This oscillator that can reach a few megahertz was obtained in a modern publication of experiments with tubes. The tube is a 6SA7.

High Gain Amplifier (CB4250E)
This high gain small signal amplifier circuit was found in an old publication on transistors....
Third Brake Light (CB4783E)
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
APR345 Rectification Synchro Controller (COM114E)
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...