These are the things I was afraid of, going through all the hoops and troubles, time, costs for what, to fix a problem that could be easily fixed IMHO by the manufacturer.
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Thanks for the detailed explanation I very much appreciated it. All the suggestions from all the other members of this forum are very welcome and like I said I will try to do whatever it takes to find the problem and fix it, it may take some time but I will do it. I will make sure I take notes and maybe record if he is ok with it and will snap few photos.
But for now I think I need to relax and listen to some music because my head is gonna explode, I have to enjoy my stereo system little bit.
Will be back with some more info when I get some.
@ tomiiv30 OP
I decided to deleted my previous post because I didn’t think it was right for me to instruct/dictate how the electrician, you hired, should go about trouble shooting for possible problems on the electrical service and or wiring of your home.
I did save the first part of my post about the two ground rods that were installed for the equipment grounding of the two new dedicated circuits.
I would appreciate it though if you would note and post back what the Line 1, leg, to Line 2, leg, voltages are as well as Line 1 to neutral and Line 2 to neutral voltages are at the electrical service panel.
To high of an over voltage above the voltage rating of the torid transformer in the amp could also add to the cause for the transformer to buzz louder than it normally would.
@ tomiiv30 OP
Make sure you ask the electrician exactly what he did with the equipment grounding conductors for the new dedicated branch circuits he installed. TAKE NOTES! A picture is worth a 1000 words. Have him physically show you exactly what he did.
It is possible the electrician wired the new ground rods per NEC 250.54 ...... I’ll give the guy the benefit of the doubt.
If he did wire the 2 ground rods per NEC 250.54 "Auxiliary Grounding Electrodes", then the equipment grounding conductors for each IG receptacle are connected to the branch circuit wiring equipment grounding conductor and the equipment grounding conductor of the branch circuit is connected to the equipment ground bar in the electrical panel the branch circuits are fed from.
Per NEC 250.54 a ground wire is installed from the ground rod and is connected to the branch circuit equipment grounding conductor. He can use any any size wire he wants to use from the ground rod to the branch circuit equipment grounding conductor. Hell, it can be 20 gauge.
Does an Auxiliary Grounding Electrode really do anything to improve the sound of an audio system? It can act as an antenna and add noise. It also provides another path for a lightning high voltage transient to enter your home. Lightning loves aux grounding electrodes.
I went through something similar with an amp. I tried dozens of fixes, from cheater plugs, extension cords, turning off all the breakers, different outlets, inexpensive filters, expensive filters, ground loop eliminators, DC blockser, power conditioners, power regenerators, isolation transformers, you name it. Nothing worked. Ultimately, sometimes it comes down to the electricity coming into your house and how it interacts with the component. I hope you have an experienced electrician, because most don't measure/don't know how to measure/don't believe are important, the kind of things, to vanishing small levels, that can be causing the problem. And if he does identify it, good luck getting your local electricity company to address it.
I'm also here to tell you that if you buy a similar priced amp from a different company, there's every likelihood that it won't hum.
As much as we like solving a problem once it's been identified, sometimes the expedient thing is the best route (i.e. I hope you haven't exhausted the store's return/refund policy).
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