This circuit is from the Linear Applications Handbook of the National Semiconductor of 1994. Transistors are common, but the integrated circuit is not easy to obtain today.
This circuit was found in the July 1982 issue of Radio Electronics magazine. The integrated...
This amplifier with low impedance OTL output was found in documentation from the 1960s. The...
This source was found in American documentation from the 60's. The diodes are germanium, and the...