I use that tube in several different pieces of gear. I bet I have at least a dozen of them as back up.
IMHO, the best 12AU7 tube out there.
I have several pairs of different type tubes that were matched and bought from the same dealer at the same time. One pair was cryoed and the other pair wasn't. I wanted to prove to myself if there really was a sonic difference in sound.
I can tell NO difference between them. This after many years of comparison.
IMHO, cryoing a tube is a big waste of money. The only advantage that I have read about, is "maybe" the tube "might" last longer, but I'm not so sure.
To Mofi and other members who took the time to respond to this thread and offered advice. Thank you. I DID RESPOND yesterday and discussed the results of the using the Mullard CV4003 tubes in the Rogue Sphinx integrated amp which incorporates a class D design. There were pros and cons. However, at the end of the response I referred to the indigenous edge or glare produced by class D amps, and happen to use the famous "F"WORD TO EXPRESS MY FRUSTRATION with not being able to alleviate the problem of that design. BTW, no profanity or discourtesy was directed at any responders on this thread or others offered in the past
This morning I received an email from Audiogon condemning my use of profanity in the response which one of their "censors" deleted. It appears that Audiogon has assumed the role of Big Brother, and I awaited to be dragged away to the Ministry of Fear for further interrogation.
Audiogon who has over the last three years, constructed a confusing, difficult to navigate web format, and initiated a dramatic increase in fees, has found yet another way to alienate members, or at least one member Therefore, I wanted to assure those who provided later responses that they were not ignored or forgotten. I am not sure if I can .continued on a blog that is incompetently run,. greed driven, and has established policies and guidelines that are rigid, senseless, and possibly illegal
Nevertheless, I don't have the energy to reproduce my response which was deleted; but I want to thank everyone over the years who have provided me with valuable advice and comments about audio equipment. I also appreciate the patience of many members who put up with some of my repetitive questions and inquiries
Good Luck to all, and Happy Holidays!! Jim