Had a pair of these years ago and would have saved lots of money if i had stopped there. Very good amps IMO...
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I somehow figured short tube life issue in my amps. There were bad coupling capacitors WIMA and replaced them with Multicap RTX of the higher voltage rating. There were actually more upgrades done at the same time that I planned so I won't bother opening up and retreiving PC board again from these compact amps. Oh, man there were so many F-s while I was trying to reach something in these amps!
I am also a happy owner of the MB-100's. I had mine for about three years. They are great. I know there are better amplifiers out there, but I think the MB 100's is a great place to get off the relentless chase for sonic narvana. This amp has a great mid, decent bass, and some nice highs. Soundstage is great, imaging is fine. Details are there. Again, there is better, but at what price? Usually much higher.
Although not expensive, these are great amps, particularly with sensitive speakers. Great midrange and breathtaking highs.Soundstaging is very impressive; much better than many expensive amps I've heard. Female vocalists sound like they're standing right in front of you in your listening room!
The bass probably isn't great, and they don't look like much. However, the upper detail and soundstaging are truly mesmerizing!