This circuit is from 1975 documentation. Transistors such as 2N3055 can be used and the transformer is of a special type. R1 is 200 ohms and R2 is 10 ohms.
A 100 nF capacitor and 100 uH inductor form this circuit suggested by General Electric in a 1964...
This 1967 Raytheon circuit uses an optical coupler of the era and has a range of 800 to 200 Hz....
We found this circuit in a 1990 documentation. It works with the power of the digital circuit...