First of all corrections to my last post, "me" instead of "be", and insert "get" in my last sentence. My typing does not always catch up with my thoughts.
I do not know which tubes are in his base model 2.1. I have 2.1R w/ a volume remote and no other upgrades. Joseph or Victor would need to answer that question.
I listened well into the evening and have been playing my go-to CDs to see if I hear any differences between the Pass s.s. pre and the 2.1. Surprisingly I hear more similarities than I do differences.I will have to wait for better wire before I make any true comparsons. After all the Pass Labs X-0.2 retailed for $10k and the Audio Horizons 2.1 retails for $2K. The only thing I can say at this point is the Pass 0.2 has much finer control over volume levels.