It has 2 x 2sc2879's in it... biased AB1. Has the preamp and such too. That particular model is a base unit, so it has the built-in power supply. Those are great little boxes if driven properly. They are not a high drive, so keep this away from the export radios... 20W PEP is good for these. 20W in = 300-350W out PEP.
I have seen these in a 4 pill form, 4 x MRF454, but they are quite rare in the base version.
Hope this helps!
~Cheers~