I am the proud owner of both a Modulus 3 and 3A in my 2 systems. The Modulus preamp is very rich sounding, offers deep bass, smooth mids and pristine highs. They are best used with 6h23neb tubes as it seems to bring out the best in them. AI's customer service is much improved. I have spoken to Art Ferris (owner and designer) on many occasions and their turn around time is about a week. I recently sent my 20 year old Modulus 3 preamp in for a minor hum issue and AI not only fixed that, but replaced some caps to bring the unit up to current spercs. They did not charge me for replacing the caps! Their service rates are very inexpensive too.
My next pre will definitely be the brand new Modulus 3B sometime down the road.
Bob