Hi guys! I have a haze 15 head, I made a couple mods to it (Brought it to jcm specs) all was good, and then all of sudden it makes loud pops and a constant crackling sound. There is no guitar signal coming through. I have inspected connection and gone back through and changed the last two mods I did. I thought perhaps the power tubes went bad so I changed them. I started pulling tubes to see if I could isolate the problem. Crackling remained with all pre amp tubes removed. I haven't modified anything in the power amp (I should mention when I removed the power tubes - there was no more noise). Can anyone help point in the right direction? I'm thinking filter caps, but I'm unsure and don't want to waste my time ordering a bunch if there's a few things I can check. Thanks!