I like the GFP-750 in active mode mated to my CJ Premier 11a tube amp. It has very good bass extension and control plus it doesn't roll off the treble. Compared to the tube preamps I own, its a little harsh but maybe I just prefer that tube sound. On the other hand, the CJ PV-14L was very smooth with nice midrange warmth but seemed to roll off the extremes a bit. The Audio Research LS16 is not as warm in the midrange but extends the low-end and treble better, but not nearly as much as the Adcom GFP-750. It also has a nice soundstage and separates the instruments better than the Adcom. There is a smoothness that I like about the tube preamps but for speed, slam, and bandwidth, the Adcom is better. But I still prefer that tube sound if its not over done. It's a tough hobby!!
PS I sold the CJ PV-14L even though its an awesome preamp. I still have the Audio Research LS16 and the Adcom GFP-750.
PS I sold the CJ PV-14L even though its an awesome preamp. I still have the Audio Research LS16 and the Adcom GFP-750.