If you're not familiar with Randall's MTS series, you should be.  This is true analog amp modeling and none of that digital nonsense.  The RM80 has 2 slots for Randall's MTS modules (not included) which are analog modeling of various amps.  This amp features 6550 Ruby power tubes, a 2x12" design with 8 ohm Celestions, rear panel bias test points, slave out, rear master volume pedal input, an effects loop, master density and presence, and includes a footswitch.