tdh888, tube rolling usually ( not always) brings out a better presentation. I did this with my ARC D70Mk2 and it also gained in resolution and overall dynamics. However, I do believe that the inherent quality of both amps ( the D79B and the D70Mk2) are as I described above. This sort of makes sense as the D79B is from the older designs from WZJ. OTOH, one could say that the D70Mk2 was also...at least compared to the current series, however, i do not believe these newer ones were designed by WZJ. Therefore, IMHO, the D series and the M100's were from his 'golden age'. Question is whether the good folks at the 'world of Macintosh' can come up with something that can out-do these babies. Remains to be seen, LOL
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