Well I had the other 4 opamps replced in the 17. That makesa total of 6 changed. My tech guy said the original are $2 opamps, and he used ones that were "la creme de la creme" costing $25/each.
I did notice a significant gain as the first 2 were changed, these were the 2 most important I believe. Now the 4 behind the 2 manis were changed and sure enough added benifits in the soundstage can be heard.
But as I say the complete 6 new opamps have made vocals seem cleaner, much more live like, bass is deeper. Power has been increased, as i play the Mississippi Blues cd, the drums now rattle the midwoofers and this just at 10 o clock vol.
At present the amp is the weak link in my system. The Thors have more potential, the Cayin has more potential.
My tech guy does not feel its necessary to change the caps to Mundorff, as the stock caps are already superior quality.
I will try a quad of sovteks to see if they beat the stocks.