This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the time that can be replaced with current common types. Power is done with 3 9V batteries.
This circuit, found in US documentation, can measure the power of transmitters up to 10 W, given...
We found this circuit in an American 1980s documentation. The transistors can be equivalent as BC548...
This setting appears with variations at various points on this site. This is from a Motorola...