We found this circuit in an old American documentation. SCRs can be modern equivalent types. The transformer has a 5 A current, according to the SCRs.
We found this receiver for medium and short waves in a publication from the 1980s. The medium wave...
Found in a 90s Radio Electrconics, this circuit is an operational one with a power stage using two...
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...