I have not heard the JC2 preamp, but I do use the Halo A21 with the Modwright LS100, and I could not recommend the combination any more highly. I know the JC2 is very quiet, but for me (and many others out there) the combination of a tube preamp and solid state power amp gives you very lifelike reproduction that solid state alone just doesn't provide, along with real speed and power.
Please do try the LS100 if you have a chance to do so...I couldn't be happier with my humble system. (I have no affiliation whatsoever with Modwright.)
Please do try the LS100 if you have a chance to do so...I couldn't be happier with my humble system. (I have no affiliation whatsoever with Modwright.)