Integrated amps and stereophile ratings confusion?

I've been looking to upgrade my tube integrated amp to a receiver as i listen more radio than cd's, and also need more power. Magnum Dynalab 208 is the perfect candidate. I even found Stereophile issue where this amp was reviewed. Upon further research i also found out that the Magnum Dynalab receiver, which is based an older, cheaper Simaudio integreated gets Class A, while the MUCH improved I-5 gets class B? I would like to hear from both Sim-audio I-5 owners and MD208. Thanks!