From what I understand this is true. They appeared before the ST series came out and Bryston built the amps for Lexicon, though I think they are MBR series though.
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I own a 512 and yes it is a re badged Bryston 9B. The only thing to watch out for is after a few years the RCA connectors will start blowing fuses in the amp. The only thing you can do is send in each amp channel to Bryston and pay 200$ to get better connectors installed on each amp channel. I have owned my amp for 5 years now and have had to have every channel repaired.
Since Bryston does not honor the 20 year warranty for the Lexicon models you have to pay out of pocket.
I am having a problem with the left rear channel. I would jiggle the RCA cable and sometimes it would come on, sometimes not. Sometimes the channel would start off not working and then come on without me doing anything. I would power down when finished listening. Next time, I would power up and it would not work.