Serge has worked in the pro audio industry for many years, I for one certainly value his opinions, and measurements, above "I think I hear a difference"
Mind you some people do not believe in evolution, and think the world was made in 7 days. Each to their own.
I'm interested in buying your amp for 1500 if it's still available. I can collect it from Norwich around the 1st September as I'm in Suffolk that weekend. Let me know how you prefer to be paid: Paypal or cash.