This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The circuit is for the AM band up to 3 MHz. The transistors are general-purpose.
This power control with SCR was found in Radio Electronics from April 1966. The components are...
We found this circuit in a documentation for radio amateurs from 1977. The circuit can be changed to...
We found this RF amplifier in documentation from the 1970s. Field effect transistors support...