Do you guys see a problem if I use an ARC LS27 with a Mcintosh amp?
I know of several who have used ARC with Mcintosh 501's. The only question is the impedance match, Mac 501's are a low 10K and most tube preamp designers recommend 20K or higher, including ARC.
That's not to say it won't work, I have used CJ tubes with my 501's and the sound has been excellent. Just something to be aware of.....