Hi John, No, I do not own the 10m yet, however, these are my must do bucket list for my tube cd-player, I have been spending money on outlet's currently that are exspensive too, I have heard many good thing's about the Amperex Bugle Boy tube's in general, I have researched and talked to many tube lover's for nearly two year's, as far as the 12ax7 tube, it's the same answer over and over, the 12ax7 mullard 10m is it if you can afford one and find it from a reputible dealer, alot of fakes out there.