I bought an Ampeg SVT CL! I followed the instructions and let it warm up first. Then I adjusted the bias controls. The green LEDs are on when I'm not playing. When I play the greens stay lit and the reds flicker on a bit. Is that normal? I've noticed that the grill cloth on the bottom front of the amp is kind of loose. Is that Normal? Not long after I bought it I noticed the screws on the bottom side were loose. I tightened them up. I'm wondering if maybe it was a returned amp? It was about $150 less than retail on Amazon Prime. It was an Amazon Choice item. None the less I'm having fun exploring the mysteries of the Ampeg SVT CL. I kind of like the new amp smell and the tones I'm getting. If anyone has info on the bias or the grill cloth on the face I would appreciate hearing about it!