This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
It can be obtained from Mouser Electronics the new 1,500 W RF high power transistor MRF1K50H fro m...
This two-door doorbell was found in a 1990s US publication. The circuit is still current as...
This is one of the many approaches we have on the site for this low power 0.5 W amp using the...