Considering they are the same as ECC32 with adapters, and Ive heard and enjoyed the ECC32! However both the pairs of ECC32 that Ive heard, had noise on them (One much more than the other), which I dont hear on on the 6SN7 That I have. It felt like the tubes were borderline going bad, but I could be wrong. The ECC31 are NOS, so hopefully they dont have that issue.
7/28/16 at 8:39am