Been playing guitar for a year now and I have been saving up to buy a decent tube amp and a cab. I finally got my hands on a used JCM 2000 DSL 100 and an Avatar cab loaded with 2 celestion V30 speakers. Due to my inexperience with tube I really don't know how to begin using one and I am also not sure if the JCM 2000 has a master volume or not? all the knobs are a little overwhelming. Could someone let me know how do I go about using the tube amp I got?