From the three amps I have, Audio Research LS2 + Parasound A21, Willsenton R8 and Muzishare X9, The X9 sounds best, more musical on all types of music, especially vocal and jazz with stock tubes without fully burn-in on the third day for the CW IV + REL HT/1508. CW IV needs a lot of power is a misconception. The X9 gets the temp right, yield deep and tight with definition bass than the R8 and even better than LS2 + A21.
CW IV owners should give SET 300B type amp a try.
CW IV owners should give SET 300B type amp a try.