Hi, I have recently purchased a jcm2000. It’s in great condition and had its valves changed at the end of 2019. I have brought a new speaker cable which I’m running from the 16ohm head output to the 16ohm output on the 1960lead with the selector on mono. I’m not hearing any buzzing or weird noises. Everything seems fine. For some reason though I can crank the clean channel to 10 and it seems kinda quiet. Barely audible at 2-3. What could be the problem? All 4 cones are working I’m just not hearing the power that I know it has.