I have read on many other post that the tube preamps mainly the C2300 produced better sound if changing out the stock tubes with either NOS or current manufacture of tubes. Many people have posted that the Gold Lion ECC83 alias 12AX7 is the one to try.
I took the plunge and changed out the line output tubes with the gold pin premium Gold Lion ECC83s in my C2500 that I have had for almost one year. All I can say is WoW what an immediate difference in sound. The slight harshness I had in the highs is now gone and the midrange has that buttery liquid sound so many others have described. I know they are not broken in yet but they sound great already. I think the Bass will improve with break in but it is still solid at this time.
If the break in time proves that the sound is still great I will probably replace the tubes in the phono sections as well. At this time I am only using the MM phono but I know I will upgrade to MC eventually. All I can say is it seems to be a worth while investment.
I took the plunge and changed out the line output tubes with the gold pin premium Gold Lion ECC83s in my C2500 that I have had for almost one year. All I can say is WoW what an immediate difference in sound. The slight harshness I had in the highs is now gone and the midrange has that buttery liquid sound so many others have described. I know they are not broken in yet but they sound great already. I think the Bass will improve with break in but it is still solid at this time.
If the break in time proves that the sound is still great I will probably replace the tubes in the phono sections as well. At this time I am only using the MM phono but I know I will upgrade to MC eventually. All I can say is it seems to be a worth while investment.