This is the result of my B.Sc Major Project where i studied the circuit of the classic 1176LN Rev D.
After the Reverse Engineering of the 1176LN Peak Limiter circuit, I developed a Switch circuit between 4 different input transformers. Then I tested the sonic differences between them.
Down here you can find the link to my Major Project Thesis and some photos.

'''Reverse Engineering of the 1176 LN Peak Limiter Circuit:
Research and Tests on the Effect of the Input Transformer'''