Phd, nice accurate review. I have the Hot Rod version which I have been told by David Belles is the same as the newer 150A. If you have one of the newer 150A's, then you essential have the Hot Rod.
Photon46, sounds like you had a faulty amp because I have Maggie 1.6's and find the Belles to be more than enough to drive them. Or like you said, could have been system synergy. David Belles did tell me he prefers to have a tube preamp in front of his Belles amps. I use a Placette Passvie and didn't have any problems which according to him was going to be a problem. Although, he did have a certain bias against passives due to "complications".
Photon46, sounds like you had a faulty amp because I have Maggie 1.6's and find the Belles to be more than enough to drive them. Or like you said, could have been system synergy. David Belles did tell me he prefers to have a tube preamp in front of his Belles amps. I use a Placette Passvie and didn't have any problems which according to him was going to be a problem. Although, he did have a certain bias against passives due to "complications".