Thank you Michael:
To answer your questions.
I also have had several NAD pieces, but never liked them.
The last one the C327 was worse than the old one I had-I think it was called the 3020 or 2030.
About the sound:
I think one's idea of sound quality depends on the persons entire life's experiences, so as a violinist, NAD just never sounded right. High frequency production of strings/orchestra were too etched.
About hybrids. I do believe that there must be good ones, especially used at my price. However, I prefer not to deal with the many considerations I see hear about tube rolling/biasing/replacement, etc. Although, I will probably sometime audition some, but not as a used - no return situation when buying used.
I've been looking here for awhile and considering that I have some knowledge/experience with SS, I'll stick with that for now.
About MF and MH Mambo, I have listened to them at a few private homes. I liked both of them better than NAD. Your comments about them are fairly close to my observations, but the speakers were both pro-ack models, small ones.
It was difficult to hear what those amps were doing at the lowest octave. Although the mambo was more real with large chorus.
Of course I take reviewers with a grain of salt, but the consistency of reviewers opinions along with the type of program material/speakers seemed to favor the sound I'm looking for referring to Classe and Copland.
Thanks for your input.