Looking to update my rig...still using Ashly SC-40 and Qsc31 from 1982. Bought new Crown amp and trying to decide on the preamp...wanted to try Ampeg SVP-CL, but out of production....want to try TBP-1 and/or Alembic F2-B, but none of the stores here in central Ohio have one to demo. Any feedback (pro or con) on these units? Lookin for some tube butter!!!