The two pictures are different, the top one has drawbars (which usually [but not always, as jp says about the Aurora being transitor] signifies a mechanical tonewheel instrument) and the one being playing does not. That means that that one is a trannie, non tonewheel jobbie. The top one has diving board keys like the spinets and the one being playing has the waterfall keys like the famous C's and B's. But it's neither of those. You can soon tell though, just start it up and if you can hear that happy whirling clatter as the tonewheel spins away then it is a mechanical tonewheel - or have a look in the back, you can't miss the tonewheel assembly. As far as starting the tonewheels models up, the later ones, like my L, only had one switch and off they went. There were hundreds of different Hammond models made over the years but they stopped making the mechanical tonewheel ones in the middle of the 70's. From then on they were all solid state. Generally $50 for a non tonewheel trannie Hammond is about all you can get. B's and C's can go anything up to ten grand for a goodie. If anybody has an interest in organs then the organforum.com is a great place to find stuff out.