What are the best tubes for a VTL TL 2.5 Preamp?

My Lamm LL2 Deluxe is quite sensitive to tube swaps (using both 12AU7 and 6922). My previous First Sound Presence Deluxe II preamp was not as sensitive as the Lamm, although tube swaps did make a difference in the system's sound.

I agree that swapping some less expensive tubes would be a good way to proceed before spending large amounts on NOS tubes.

By the way, there are many domestic NOS 12AU7 tubes that can be excellent...Raytheon and RCA 5814A come to mind. They run about $40/pair on E-Bay, and they sound quite good.

i suggest that you consider ge 5814 black plate along with the other selections.

Mfb33,

"By the way, which has more impact on the sound the 12AU7"s or 12AT7"s?"

I'm not sure which has more impact since I swapped both at the same time. My guess is that they both do since the signals flow into both sets (1 set for input and 1 for output).