UPDATE, i bought the amp for 500$.tech help needed. Its got an issue either in output or preamp tubes. On the boost channel there is very little volume. On the clean channel its loud but not as loud as a 100 watt should sound. How do i diagnose if its tubes or other issue like transformer? All tubes are glowing but drive channel is a whisper. Clean channel seems as if its on volume 3 , volumes are all the way up, when compared to my 900. gents, sonically is the 4211 jcm 800 similar tonally with the 2203? I know it sounds like a very dumb question but see one for $850. Thoughts on this model which appears to be a 2x12 combo 100 watt. Anyone own or play this model before? I would prefer the 2203 but if its the same guts as a 2203 it seems like a sweet deal Anyone? Bueller?