Hey guys. I scored a Mesa ED combo. The amp is crazy dark and muffled until treble and presence are past 2:00. I've seen many youtube clips with everything on 5 that sound great. Mine sounds like the tone on my guitar is rolled all the way back. I've replaced tubes and no change. One thing i have noticed is that with the reverb bypassed the amp is MUCH darker. Once the verb is switched on and turned up the amp becomes a lot brighter. Is that just the nature of this amp? I don't want to waste $$$ getting it looked at if this is just the character of the amp itself.