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Hi Guys, Would need your help to verify if you guys also experience the same issue. I seems to have a weird old rotary phone like noise coming out of my amp when i turn the EQ knob especially on the treble knob, and especially obvious on topology II,III or IV, when you turn up the channel volume up to at least close to 12 oclock or beyond and considerable amount of master volume. Can anyone of you guys verify if you have the same issue? I try bypassing my pedals where my guitar goes direct into/ infront of the amp and still the same issue. It is more prevalent when you turn the volume and master real loud. Without playing any note, guitar volume knob still up, muted the strings, while turning the treble eq knob, gave the dialing sound. A low-midrange kinda "dub dub dub dub dub dub" like noise. I call up the tech shop , authorize dealer for Line 6 where i bought the amp from, and they said it might be the motherboard or IC issue. I just bought this amp 3 days ago and now this issue? I really hope the guy is wrong. Hope any of u guys can assist here. Thanks