System Edited: My Herron Tube Rolling Adventure continues. Currently using NOS Amperex 7308's, USN-CEP tubes, vintage 1965. Really nice sound, balanced throughout the spectrum, with airy top end and natural, not boomy bass. The holographic imaging and pace are tops. The system has an ease and warmth without the unatural midrange presence I noted with the Philips/Mullard/Holland 6922's. Not cheap, but in my setup well worth it. These are keepers!
BTW Akozar, in my audition of the Ayre monos I did not have a chance to really crank up the volume, but they definitely sounded unrestrained and capable. I am pleased enough with my Classe's (especially with the sweet music I'm getting now with my new tubes) that I am not lusting after any other amp...for now