I found NOS tubes really improved the overall sound of this preamp. I highly reccommend the Siemens tubes that Joseph places in the unit as an upgrade. I tried some nice Mullards and Amperex Bugle Boy (white lbl), but over time I found the Siemens to be the perfect balance of neutrality and warmth. The Mullards were wonderful, but a little to "tubey" for my ears. Lost some of the transparency and softened up the dynamics a little to much. At first I loved them, but over time I found the above to be true.
To my ears the stock tubes lacked body and warmth and in the end were just less musical.
These comments are relative of coarse as the unit sounded very good with stock tubes. NOS's did improve the sound as noted above.
Bill
To my ears the stock tubes lacked body and warmth and in the end were just less musical.
These comments are relative of coarse as the unit sounded very good with stock tubes. NOS's did improve the sound as noted above.
Bill