helomech
If you have audible buzzing, hiss or hum, try using a "cheater plug" for your amp and preamp cables.It's fine to use cheater plugs for diagnostic purposes - they can be very helpful for that. But it's not safe to use them as a "solution" for ground loop problems. It's never wise to defeat a safety ground.
There’s a reason why so many supposedly great power conditioners end up on the used market. Most are complete snake oil.That's pretty silly. You can actually measure what a power conditioner does, so it's hardly "snake oil."