Well, my Dna 750's are amazing and perfect.
I talked with Dan babineau on the phone about how I came to acquire his old amps, we had quite a nice long audio discussion , a stand up knowledgeable man!!
he confirmed these amps had the ultra upgrade by CJ before they stopped offering it. The all Teflon capacitor upgrade is what I have, I called the old owner, the woman who sold me, her husband purchased these amps and used for a year, lightly. Good news!
they were not really not broken in all that much, so I have some top shelf amps to say the least! I broke them in for months with a new pair of Energy rc-70's, which also were broken in for quite a while.
I h ave about 175--ish hrs I think on the system, not broken n yet, and it is so smoooooth, airy, just beautiful sounding. Acoustic guitar is simply there and breathtaking, vocals, and mercyful fate is on par with Kim singing in my room!!! Just stunning!
i am using the Sanders preamp, and any bass complaints I had are gone, either I am used to the setup now, or the CD player, cables and break in are part of the sound I now hear.
I hope olé these last me 20 years or more. I am happy with them !
Cheers, I have music to "hear".