(If you need me to provide the pdf , i can not do that , because i can not share copyrighted materials )
: Dozens of designs for pre-amplifiers, power amps, and stereo systems. 500 circuitos practicos parte 1 pdf
The original diagrams were printed in high-contrast black and white. A high-resolution PDF allows you to zoom into component values (resistor color codes, capacitor microfarads) that are often illegible in photocopied physical versions. (If you need me to provide the pdf
by James A. Whitson (1987).