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There are some information about that new Japanese amps in the threads below:

http://www.audiocircle.com/index.php?topic=65312.0

http://www.diyaudio.com/forums/solid-state/37247-any-info-manual-about-yamaha-b-2-a.html

It looks as it is some kind of custom production (though I think it is lie) but they went for Yamaha B1 version where plus and minus made on the same polarity transistor. The B2 use commentary pairs, so they are different all together.

I would like to pass some comments about my Yamaha B-2 experience. I cannot comment confidently about sound.  I do not want to drive with it the Macondo line-arrays, so I use it with MiniMe. The MiniMe has very good Focal Utopia TN51 tweeter (I love it a lot) but everything else is not what it need to be. The B-2 is very cool designed amp, small and sexy. The whole mixing-switching board shall be trashed and bypassed. This leaves a lot of space inside right next to the front panel. Those 4 regulators in the front panel need to be trashed and instead then placed multi-turns for adjustment of bias and DC. In the real word it would be very cool to set bias with a respect to the given specific load of the B-2, measuring the lower distortions and at maximum power.

I based my B-2 at 68mA and I will let it to be as it for a while. After all that 30 year the amp does very nice with .000 if DC at output. I t would be more fun if I have better speakers for the B-2

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