This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
Of course, the range of this transmitter found in a 1992 documentation is not exactly 4 km, as it...
This is the receiver for the CB1364E transmitter. Other receivers can be found in this section of...
This circuit was found in Motorola documentation from 1968, using high power transistors and...