I bought 2 pairs of Mullard NOS 12au7 (CV4003), one set cryoed and the other pair not cryoed. I will be dammed if I could tell a difference. Incidentally, one of the cryoed tubes started making noise right after the 90 day return policy ended. I too got them from Upscale.
Cryogenic treatment of tubes? Anyone with experience positive or negative?
I just ordered a matched pair of 12au7 mullard NOS tubes for my primaluna amp. Ordered them from upscale audio. They offered the cryo treatment, so for only 8 bucks more, I got it.
wondering if anyone has done enough listening to have an opinion on the sonic benefits, or the technical reason why it makes (or does not make) a difference.
wondering if anyone has done enough listening to have an opinion on the sonic benefits, or the technical reason why it makes (or does not make) a difference.