Hi to a rare fellow owner of the Clements RT-7 loudspeakers. I use the venerable tube Cary SLA-70Sig with full range glorious sound. The bass extension and bass slam both quite incredible despite the general belief that only transistors really grab hold of woofers. Also, the ribbon tweeters really sing with tubes. For CD's I use EVS Ultimate Attenuators directly attached to the RCA input jacks of the Cary amp so no separate preamp or extra interconnect required, which saves money. As you may know, selection of tubes optimizes the performance, but this amp sounds fine even with modest cost modern tube choices. A more expensive choice that I have listened to would be the Aronov LS960 which creates RT-7 bass that will allow you to make fun of speaker owners with separate subwoofers. Both amps come up occasionally on Audiogon. This is a minority report since I think you will receive many more excellent transistor or hybrid recommendations. Perhaps recommenders will comment whether their favorite amp allows the very revealing ribbon tweeter to do its thing without any trace of listener fatigue setting in.
In search of Power Amp replacement
I'm powering a pair of Clements RT-7's (T-line & ribbons) 6.5 ohm and have a Forte Audio Model 2 Pre. These are not the most efficient speakers on the planet but I have grown to love the way they sound. They have very deep bass and the amp would need to shine in the lower registers. Bryston and Creek have been suggested to me but I've not heard either yet. The sticky point is my current budget. I need to keep the cost in the 1k range(new or used). I would appreciate any and all suggestions.