The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The maximum power is 7 W with a 8 ohms load and the power can be between 9 and 14 V.
The circuit of the figure can provide voltages of 5, 8.9 and 12.5 V at its output, all doing this...
In the figure we have an application of ON Semiconductor's own semiconductor manual from the 80's....
This circuit was found in Philips documentation from 1969. The components are from the time...