We found this circuit in the 1982 SGS linear integrated circuit manual. The L149 is not common today and the circuit can be implemented with equivalents.
This excellent 30 W tube amplifier appeared in the April 1963 Radio Electronics magazine that...
This circuit with only one transistor was obtained in an old English documentation and can be...
This circuit was found in a publication in the 1980s. Modern equivalent components can be used. The...