I'm asking simple questions , to be able to determine which of two possible malfunctions is happening , sorry if I can't transcribe that in Law terminology .....
again - if you (or your tech) re-read what I wrote above, you'll be able to determine what is in question and act accordingly
if not , I wish you all the best anyway
It is really hard to make law man to understand simple solution,
why the seller should be responsible for lot of harmonics in the utility power supply.
If c10m drove by himself amp from the seller, then he listened amp probably and verifies it's functionality.
It is very common that harmonics in the ac power supply trying to find shortest way to the ground and if the energy of harmonics is to high, capacitor may blow and make short circuit.
Users and utility suppliers should take care that voltage harmonics don't rise above some limit (something about 2,5%). Today in the usage there are lot of devices which produces a lot harmonics and that is the reason why that happened.
why the seller should be responsible for lot of harmonics in the utility power supply.
If c10m drove by himself amp from the seller, then he listened amp probably and verifies it's functionality.
It is very common that harmonics in the ac power supply trying to find shortest way to the ground and if the energy of harmonics is to high, capacitor may blow and make short circuit.
Users and utility suppliers should take care that voltage harmonics don't rise above some limit (something about 2,5%). Today in the usage there are lot of devices which produces a lot harmonics and that is the reason why that happened.
Last question: the technician checked the iec plug on the back of the amp with the tester and find out a ground leakage without connecting the amp to the mains and the caps were empty (no blue light on the front). So my question is can empty capacitors cause ground leakage? Or the ground leakage is caused somewhere else (i.e. toroidal)? I would like to avoid anothe journey to Croatia...many thanks to everyone
Since you have Wayne'a attention I would suggest to also wait for his
opinion before deciding on your next step.
opinion before deciding on your next step.
If it has to be serviced by the official NP center it will cost a lot, and i haven't the original crate so i prefer to bring it back to Croatia instead.
I am sorry to hear that you didn't listen the amp.
Toroidal are rare in fail, that is why Zen Mod said to check the capacitor filters on the input of ac power.
Toroidal are rare in fail, that is why Zen Mod said to check the capacitor filters on the input of ac power.
I checked the main fuse in my home system and it's an ABB 32 ampere one. So it should'd be the problem...
If I can chime in a little. The rating on your breaker is plenty but it sounds like it's a GFI type (ground fault interrupter). It's sensing the ground leakage and tripping. I don't know what the code is in your area but in the states it's usually only required in kitchens, bathrooms and sometimes bedrooms. They can be a real pain.
The capacitors ZM is describing are a sort of ceramic disc type that don't really charge and discharge like the big caps in the power supply you're thinking about. They connect between the A/C line coming into the amp (IEC connector) and earth/chassis ground to filter any RF interference going into (or out of) the amplifier and shorts those signals to ground. We usually don't need to worry about those frequencies in audio but they're required in order to meet certain governmental rules (CE, UL, ect) for commercial sellers. They typically don't go bad and are a special X or Y rating for line purposes, but are still readily available to you and I.
Ya know, as I think about it, I wonder if you could have a serious RF signal coming in from somewhere that's causing the issue. Nearby radio station maybe? Is it even possible to create enough voltage to trip a GFI sensor? I don't know, thinking out loud.
The toroid transformer is a very unlikely source. They very rarely go bad and if they do it's not usually an in between thing. They just stop working all together.
So if the seller didn't have the same GFI type of breakers you do he would not have known there was any leakage going to ground and would have worked perfectly for him. You can't blame him for the fault. You do however have the attention of the actual designer and manufacturer (Nelson Pass and Wayne). If you are willing then I'm sure they will get you taken care of somehow.
I'm only a DIY'er of their designs as I could never afford something of that caliber, (I wish though!) but I can say with some confidence if you stick with it you will be well rewarded with beautiful sounds. 🙂
I hope you get it sorted. Good Luck!
TJ
The capacitors ZM is describing are a sort of ceramic disc type that don't really charge and discharge like the big caps in the power supply you're thinking about. They connect between the A/C line coming into the amp (IEC connector) and earth/chassis ground to filter any RF interference going into (or out of) the amplifier and shorts those signals to ground. We usually don't need to worry about those frequencies in audio but they're required in order to meet certain governmental rules (CE, UL, ect) for commercial sellers. They typically don't go bad and are a special X or Y rating for line purposes, but are still readily available to you and I.
Ya know, as I think about it, I wonder if you could have a serious RF signal coming in from somewhere that's causing the issue. Nearby radio station maybe? Is it even possible to create enough voltage to trip a GFI sensor? I don't know, thinking out loud.
The toroid transformer is a very unlikely source. They very rarely go bad and if they do it's not usually an in between thing. They just stop working all together.
So if the seller didn't have the same GFI type of breakers you do he would not have known there was any leakage going to ground and would have worked perfectly for him. You can't blame him for the fault. You do however have the attention of the actual designer and manufacturer (Nelson Pass and Wayne). If you are willing then I'm sure they will get you taken care of somehow.
I'm only a DIY'er of their designs as I could never afford something of that caliber, (I wish though!) but I can say with some confidence if you stick with it you will be well rewarded with beautiful sounds. 🙂
I hope you get it sorted. Good Luck!
TJ
Again, the amp caused the tripping also at the technician' s and not only in my home. Why everyone doesn't consider the issue was well known by the seller? I didn't listened to the amp before to buy. Anyway i'm happy you all agree the problem is hardly caused by the transformer (the most expansive part, i suppose). Thanks everyone for your efforts, gentlemen!
This amplifier went to Germany originally. A replacement power switch was sent at some point in time indicating it had been worked on in the field. Check resistance from AC incoming ground to the chassis it should be zero or close also check from this point to RCA shell for about 10 Ohms.
If the above measurements are okay it could be a bad or leaky capacitor on the AC line. There are three of these XY type parts on the main PCB they are for RFI and not required for operation. I can't think of a single instance of transformer failure that I am aware of but if it has been serviced or modified in the field it is possible.
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