Preamp to match Parasound JC1 monos

Looking for preamp to match the JC1s and B&W N802s. Currently using Meridian 502 pre,
Thank you
Cpk, I had an SF line 2 also, it was a great pre. I wish I still have it to try with JC1's. Thank you all for your responses.
Bob Crump was adamant that preamp be balanced, had Pass X1 for many years with JC1s, recently bought XP20, still breaking in but sounding promising.
Ran the Blue Circle BC3000MKII with upgraded GZpz power supply - it was a fantastic match.