hoping someone can help. Been trying to contact Marshall but no word back yet. I bought a DSL20 head and it had horrible feedback problems at moderate gain levels and a background noise when not playing that sounded kind of like wind blowing into a microphone. Not crazy loud but enough to think it isn’t normal as none of my other amps do this. So I exchanged it. Got my new one yesterday and it doesn’t have the feedback issue but it does still have that background noise like wind blowing into a microphone or something with some slight almost crackling noises. Is this normal for these? Does anyone else have this problem? It does not change with volume or gain or the channels. It remains the same no matter where those settings are set. I thought maybe it’s more sensitive to background electrical noise. If that’s the case is there some way to reduce this? Any help would be great. This is my first Marshall amp tho I have had other tube amps. I’m going to try putting in some better tubes and see what happens. Guess I really just want to make sure nothing is wrong with it. Technically it’s not horrible and I could live with it if I had to since I do love the way it sounds when playing. Just kinda wish it wasn’t there. Thanks in advance!