Audio Research Corporation website and ARCDB website has everything you want to know...it is not a hybrid however. Are you refering to a newer version of the SD 135?
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The SD135 is the latest model solid state power amp from ARC. I am not aware of a new hybrid model SD135 and doubt ARC would release a product of completely different design using the same model number as it would completely confuse everyone. As the owner of a SD135 I can say that it may be the finest amp I have ever owned, including ARC's own 100.2 and 150.2. I am working on setting up an ARC amp shootout featuring these amps as well as a VS110 and a McCormack DNA500. It should happen in September and I will post the results. If you are looking for a solid state amp with tubelike dimensionality and timbres then I would encourage you to have a listen to the SD135. It is phenomenal.
Well after much debate i have made up my mind. I will be stearing away from the tubes just because of lack of power. I have opted to go with a Bryston Bp 26 with dac incorporated and Bryston's 4b sst square. Thanks for all the patients and knowledge to the forums on audiogon. I should get the 4B sst in about 2 weeks and will keep you updated. Thanks again to everyone.