View attachment 60783
View attachment 60784
When I am on a high gain preset (for ex: High Gain Recto's no noise gate), the noise starts to take place after string vibration decays. As I go away from the tower; the noise decreases "exponentially" I think. I assume using longer cables, putting the tower down and far away could solve the problem. I have seen one of my friends made a faraday shield with the tower's cardboard, he says it works for him.
Regarding your post about your grounding issue I would like to add my experience 4 years before. AfterI purchased my mini recto, I heard an incredible hum from amp. I took the amp and cabinet and went home, I knew my houses ground was properly done before. There were no hum and no noise. Called the engineers to original place and they measured that earthing was near 0.
Can you make a video or capture the sound of that noise ? maybe you already solved the emf problem but suffering from ground ?
I took some sound samples for clarification. Taken with audacity through macbook air. Air norton Pickups at full volume. Axe preset is "LT MK8 - MKIV Chunk"
Check this playlist, the first noise was my problem, changing guitar's pickup position helps, getting away from pc helps, what truly amazes me is of all those emf around; axe is still silent as an owl flapping at night. ( I hear nothing even in highest gain and output settings when volume of guitar is at 0)