I too am a satisfied listener of one of Aric's unlimited preamps. I would love to match it with one of his Transcend amps but my checkbook always has a way of ruining my desires! I replaced the supplied JJ 12ax7 tubes with some Tungsol tubes that I had that were broken in already and I like it very much. To be fair I didn't give the JJ's time to break in but they are being broken in in another source and I'll swap em back in to the unlimited when they are to compare. Aric recommended also the JJ gold pin 12ax7 as an upgrade. I don't know what I would do to improve or upgrade the unlimited as it nice as it is. It is so nice dealing with a small outfit that has a human face to their business! The Unlimited was money well spent imo Aric was a pleasure to deal with.
Aric Audio Systems Unlimited Preamp
They have a tube model called Unlimited that appears to be a decent value for < $800. It is tube rectified and with pair of tube voltage regulators and 12AX7 driver tubes. It even has a phono stage. Anyone is familiar with this preamp?