MrGil: Have you tried subbing another 6922 type for the 6N1P tube? I did not when I had the amp in my possesion as I could not locate them at the time, but wonder what a nice soft Amperex or Mullard would sound like. I agree with buying the best piece within the budget and then upgrading others in the same manner later. This saves a lot of money in the long run and you end up with a better setup in the end. I did this when I purchased my SET amp, which at less than half off retail (used) was still $300 over my budget which happened to be $1000 at the time. But I now own it and love it.