At the very least, not all products appear to be affected. That's good news for customers, and good news for Schiit.None of the ones I've tested were like that. The paint is ground out of the chamfer during manufacturing specifically for that purpose.
In any case, the new test procedure checks for grounding in toto, and went into effect today. All shipping Jotunheims were checked and found to have proper grounding. Tomorrow we'll go through the rest of the stock just to be sure.
Again, if you have issues with your specific Jotunheim (or any other product), please contact us at [email protected] and we'll be happy to take care of it.
They have neither confirmed, nor acknowledged the issue, just that it would be one if it indeed happened. They haven't changed how they produce their items, just how they test them, in order to rule out an issue that did not occur in any of their currently shipping units. They are also going to verify the amps currently in stock.Schiit are doing the right thing, confirming and acknowledging the issue, and providing an immediate change in production going forward. I don't think you can ask for more than that.
Jason was talking about masking, i.e. some mask is supposed to prevent the paint from reaching the inside of the keyhole, precisely to prevent this issue from happening. Not sure about the specifics, but there shouldn't be any rasping involved.I wonder how they handle this. Does some guy with a file give it a rasp once in each hole for the lid? Seems the issue of hum crops up according to forum reports on the silver models more than the black case models. That makes sense as it is easier to see shiny metal from rasping off black paint than would be the case with silver.
I want to emphasize this again. Neither my mod, nor process outlined by Schiit (which is the same as mine) are sufficient for safety! There has to be secure green wire to the chassis with the proper screw and washers."Effective" chassis earthing as I outlined in the previous post would solve it once and for all.
Two earth lugs, a pot shaft solder ring, a machine screw, star washer, flat washer, shake-proof split washer, a nut, and maybe 12" total of green/yellow earth wire.
Maybe 10 cents all up?
Sounds like you are good to go as far as hum prevention is concerned. The safety issue may remain per my previous post however.Thanks for reviewing the jotunheim. I tested the grounding of mine with my Multimeter and got about 1 ohm for both the mains ground-top chasis and mains ground-analog input shielding. I've never noticed any hum or noise with it.
I want to emphasize this again. Neither my mod, nor process outlined by Schiit (which is the same as mine) are sufficient for safety! There has to be secure green wire to the chassis with the proper screw and washers.
This friction contact is OK for getting rid of hum but is not in any way sufficient for safety. You can't rely on the pressure of some folded metal for a secure, high current carrying surface.
Such a test will likely fail CE certification. So it is important to inquire if Schiit has used an independent lab to certify this unit. Or what test if any they have run to have ascertained that a bit of contact between the pin the the keyhole is sufficient.