We found this circuit in a 1968 Electronics World. The transistors are from the era and information about the transformer was included. Transistors support current equivalents.
This 1965 General Electric circuit uses a "Thyrector" that is a suppressor of the time. The...
This circuit allows you to adjust the balance between channels of a stereo amplifier. The circuit...
With this circuit of a Popular Electronics from the 90's it is possible to test a diode with the...