I have been a audio enthusiast for about 10 years, as perhaps most chasing a sound that I am happy with. Plenty of speaker amplifier combinations have come and gone. My musical fidelity A308 Integrated came the closest but after John working his magic on my amplifier with his upgrade service the difference it has made has I believe got me to the place I have been chasing. I was shocked at the difference it has made to the same amplifier. Thank you John.