In my review of Schiit Jotunheim by chance I noticed that the upper part of the case is not grounded. As such, it allowed the transformer to induce hum into the output of the amplifier. Here are the measurements showing such:A jumper between the drilled holes that are not insulated and the back RCA jack shield got rid of the noise:This quick article is about accomplishing the same without said jumper.Note that this is both a performance issue and potential shock hazard. Metal cases on a three-pronged outlet must be security connected to mains safety ground pin. While my fix will also help with the safety issue, it is insufficient. A proper screw and ground wire is necessary for proper safety grounding.There are lethal voltages inside and you can easily shock and kill yourself. So check and double check that you have unplugged the mains cable.The case is tricky to take apart and that actually contributes to the problem. First, take off the large volume control by unscrewing its tiny set screw (be careful to not round it). Behind it are a nut and washer which you need to remove with a pair of pliers Once there, you have this:Now the hard part. Pull the case forward some. It will put up fair amount of resistance at first. Slide it forward with fair amount of force and it should move at least a quarter of an inch. It will then get stuck. The pins are in keyholes and if you slide the case too far, they will latch on the opposite side. I found that putting the case upside down on my lap, sliding it forward and back, and eventually tilting it to clear the volume control shaft works.Don't be concerned if you can't get it off immediately. Go ahead and curse fair bit as I did every time i tried to open and close it. It is necessary and gets you refocused on getting it open. It will eventually come apart and you see the inside guts:There are four pins in the top lid that slide into those keyholds. As luck would have it, they are not insulated like the rest of the case is. So what you need to do is sand/file off the narrow part of the keyhole where the pins seat when closed. I used a diamond file and kept the unit upside down to make sure nothing fell in there. Alternatively you can use a sharp pick and scrape off the paint.Here, you need to have an ohmmeter to check that you have sufficiently exposed bare metal. Connect the probes to the different keyholes and you should get connectivity in the 1 ohm or less.The powder coating or whatever they have used is very tough. It took fair amount of doing to get the paint exposed. A better solution is to take the entire unit apart and use a rotary tool to get in there and really clean up the paint. Better yet you could sand of the paint around the top of the keyholes to expose even more metal for good contact. Be sure to do the same in the lid. The issue here is that these components may rust. Use your own judgement.Turns out that the above is NOT sufficient because even the bottom of the case is ungrounded! All that stays between you and electric shock is that powder coat. To fix that, you need to take out these screws and like above get rid of the pain that exists on the chamfer in the case:Screw them back in and check with a multimeter that the keyhole area you sanded off now reads a low resistance with either the mains safety pin in the IEC connector or the outside of the RCA connectors. Keep sanding and exposing fresh metal until you get to a near short (1 ohm or less ideally).Then put the lid back on following the reverse process (yeh right, as if it is that easy). Once you put the case all together and before putting the volume knob and screw back on, run this test to make sure there is good continuity:Unlike the above picture where I tested before this mod, you should get a short/1 ohm or less resistance. I had to be careful with my loaned unit and I think I got it down to 2 ohms or so.That's it.I am hoping that Schiit responds and makes this fix for owners. But if not, you can improve things with this mod which takes 10 to 15 minutes.Post here if you have this problem and the mod helps things.As is always the case,You can easily damage the unit once inside. So be careful.