About 4 months ago I bought a V2 second hand. It had some crackling noises that would randomly come and go. I decided to change all the tubes (3-12ax7 and 1 12at7) and clean the tube sockets. This seemed to help the problem a little. Now it has come back with a vengeance. I've changed all the tubes again and it did not help. The tube OD channel sounds like an old cable tv set when the cables out and you have the black and white dots on the screen mixed with some random crackling. Not sure if its something I can fix myself or if I have to send it in for service. Has anyone else had this problem? I love the sound of this amp, but its been nothing but an uphill battle with it. Any advice would be appreciated.