Sand_Man:
I am glad you are enjoying the Model 6's. I ran those amps for three years and regret selling them. Some friendly advice:
(1) Try to buy the battery power supplies, as they were voiced with batteries and sound best that way (Model 6's come up for sale on A-Gon as often with batteries as without, and someone will be willing to sell the batteries separately). The amps produce objectively less power with the batteries, but subjectively sound like they have more headroom because you can turn them up quite a bit louder before the sound falls apart due to noise (higher volume also magnifies A/C line noise, and the difference with the batteries is not subtle). I suggest that you read Stereophile's multi-part review of the Model 2, which contains a section devoted to how the amps sound with the batteries.
(2) While they work fine when run single-ended, run them balanced, as they were voiced in balanced mode and sound best that way.
(3) Regarding what preamp to run with them, I don't know what your budget is, but I would look at a top differential balanced preamp. The safest bet would be a Rowland Coherence II Mk. 2 (disclaimer - this has been my main preamp for the last five years) and a Synergy IIi would also be very good. The Levinson 32 would also likely work well, although I am just guessing. All of these pre's are quite pricey, though. As for balanced tube preamps, I am against the common wisdom as to tube preamps generally and prefer top solid-state due to noise issues and the problems most tube pre's have driving longer interconnects, but if you must, I would try to find an Audio Research LS-5 Mk. III (some feel it is the best sounding preamp ARC has ever made), ideally turbo-charged with new capacitors and higher-shelf tubes. Ralph Karsten's (Atma-Sphere's) top preamp or the better BAT and Audio Research balanced tube pre's are also obvious contenders.
No offense intended, but your c-j PV10 is essentially a mid-fi component (I know it well) and is really holding you back.
Enjoy your Model 6's -- they are spectacular amps that layer sound like a top tube amp, yet are extended at the frequency extremes and have some of the highest resolution available from any amp technology. In solid-state, only the darTZeel is better to my ears.
I am glad you are enjoying the Model 6's. I ran those amps for three years and regret selling them. Some friendly advice:
(1) Try to buy the battery power supplies, as they were voiced with batteries and sound best that way (Model 6's come up for sale on A-Gon as often with batteries as without, and someone will be willing to sell the batteries separately). The amps produce objectively less power with the batteries, but subjectively sound like they have more headroom because you can turn them up quite a bit louder before the sound falls apart due to noise (higher volume also magnifies A/C line noise, and the difference with the batteries is not subtle). I suggest that you read Stereophile's multi-part review of the Model 2, which contains a section devoted to how the amps sound with the batteries.
(2) While they work fine when run single-ended, run them balanced, as they were voiced in balanced mode and sound best that way.
(3) Regarding what preamp to run with them, I don't know what your budget is, but I would look at a top differential balanced preamp. The safest bet would be a Rowland Coherence II Mk. 2 (disclaimer - this has been my main preamp for the last five years) and a Synergy IIi would also be very good. The Levinson 32 would also likely work well, although I am just guessing. All of these pre's are quite pricey, though. As for balanced tube preamps, I am against the common wisdom as to tube preamps generally and prefer top solid-state due to noise issues and the problems most tube pre's have driving longer interconnects, but if you must, I would try to find an Audio Research LS-5 Mk. III (some feel it is the best sounding preamp ARC has ever made), ideally turbo-charged with new capacitors and higher-shelf tubes. Ralph Karsten's (Atma-Sphere's) top preamp or the better BAT and Audio Research balanced tube pre's are also obvious contenders.
No offense intended, but your c-j PV10 is essentially a mid-fi component (I know it well) and is really holding you back.
Enjoy your Model 6's -- they are spectacular amps that layer sound like a top tube amp, yet are extended at the frequency extremes and have some of the highest resolution available from any amp technology. In solid-state, only the darTZeel is better to my ears.