Ok so i admit i dont much about amps or cabs or setting up speakers and whatnot all i have and have ever had is a 70 watt combo thing from cash converters, kind of a plug and play thing! so now i am looking into the furture and i need more, much more power, and i hear combos are to be kept away from! so then it comes to this head and cab deal i suppose! i read alot here and basically get very confused because there are HUGE holes in my knowledge! 1)like matching heads with cabs? how is that done? how do you know what is the right power and compatibility and such? can just add as many and whatever type you want? 2)ohm levels? what differnce does it make? how do you change it? which is the best? 3)all this tube and solid state stuff, like an ampeg head from ampeg.com has the following under specs:<i> Preamp (Tube or Solid State): T (2 x 12AX7) Driver Tubes: 2 x 12AU7, 12AX7 Power Amp (Tube or MOSFET): T (6 x 6550)</i> -> i dont get that at all except that is has '2X12' so does that mean thats the speakers needed? from what ive heard tube is the way to go. 4)and whats this difference between pre-amp and power amp? you need em both? ok so there is alot of stuff i dont know about heads and cabs and if you guys help me out here i will be very grateful! and i will understand some stuff people are actually talking about!