I have a Berlin Classic and recently converted it into a Turbo. The pump on the turbo has the airline coming out of it and a dial to regulate the air intake. The pump is not a rio, it is a Red Sea. It was not performing at all, so what I did is put the venturi cone back into the skimmer and removed the airline from the pump and installed it onto the skimmer body like it used to be before the "upgrade". Now it works better, but I am still considering a new skimmer allltogether. I have read about people replacing the venturi cone with a different brand and achieving better results.
But to answer your questions, a classic has NO
airline tube connected to the pump at all, the tube comes out of the skimmer body, the Turbo has the tube coming out of the pump.