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Old 15th May 2009, 05:24 PM   #1071
AndrewT is offline AndrewT  Scotland
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Let's find out what has been fitted from Line to Earth,
Then we can make informed comment.
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Old 15th May 2009, 06:03 PM   #1072
troystg is offline troystg  United States
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The angle of the picture may be causing some confusion.

That is a standard 3 pin IEC socket.

The center pin is the ground.

He has wires on all three pins.

He has 2 caps jumping from the hot and the neutral pin to the center ground to shut HF noise.

I'm going to break out visio and try to draw it quickly.


The caps are in parallel across the wires, not series.
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Old 15th May 2009, 06:26 PM   #1073
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Quote:
Originally posted by troystg
Mike-

Everything looks good except that Romex!! Get rid of that and cut up the server power cord instead.

Funny how yours is the opposite of Peter's Patek chip amps.

That is prolly the best use of a PC case I have seen because when they are filled with PC parts and operational that means WORK.

Thanks for the feedback.
The transformer is from SumR. They are based out of Toronto. If you look in the original post there is a link to them. He works with many audiophiles. The service was fantastic. It is a small operation with quick turnaround, I got mind in about two weeks and it took four days just for the epoxy process. I paid about $100CND. I will be going to him for any further transformers I need.
As for Romex I assume that your talking about the "in-wall" power cable. It was the best thing that they had in the store I was at. I figure it gets power to flow smoothly for hundreds of feet it will be just fine for a foot
As for being the opposite of the Patek. That is for sure! You could fit about twenty of his amps in this massive case. I did try and keep the audio lines short enough and of equil lengths. I am happy to have the option to easily put another amp into it, and I HATE working in cramped spaces. If I ever feel the need I can build another kit and use my external crossovers to bi-amp.
Also Thanks for the kind words on the use of the case!

Quote:
Originally posted by AndrewT
Let's find out what has been fitted from Line to Earth,
Then we can make informed comment.
The AC ground is attached to the case. From there power runs through the transformer into the rectifier. Each side of the rectifier and the left and right amps are all grounded to the case. I am very new to this and my understanding of electronics is next to nothing. I can tell you though that this amp (after installing the 300pf caps on the 7-8 pins the) is silent. As you can see I have no attenuation at all (I use an external passive attenuator for this). At full gain I have to put my ear an inch from the tweeter to hear anything at all. From even one foot there is no way to tell that the amp is on. There is absolutely no pop, click or thud when turning it on and off. I am in no way worried about the caps on the AC ground as this is the quietest amp I have ever heard.
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Old 15th May 2009, 07:03 PM   #1074
troystg is offline troystg  United States
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"As for Romex I assume that your talking about the "in-wall" power cable."

Yep, Romex is a "brand name" for a brand of house hold construction wire.

It is better to use stranded wire there than solid but the world won't stop turning if not.

In houses it is ok because there is no "real" movement in the wiring. All contact is made at the receptacles so the solid stiff wire is not disturbed.


In portable / movable electronics the MAINS AC is generally stranded wire and if any, only the DC supply or output signal conductors are rigid.

Again, not the end of the world, but it is easier to work with, dress and secure the stranded wire.

Finally, yes you could do a surround system or an individually dedicated room house amp in that chassis.

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Old 15th May 2009, 07:08 PM   #1075
AndrewT is offline AndrewT  Scotland
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Mike T,
tell us what those two caps are that you have connected from Line to Earth.
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Old 15th May 2009, 07:26 PM   #1076
troystg is offline troystg  United States
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Looking at the picture and the wiring again..

I bet he didn't even put them on the IEC input socket!!!

I bet he made his connection at the switch! Those RF shut caps were probably put on by the server manufacturer...


Thinking about it further...

I bet the Server manufacturer didn't even put those caps on to block garbage coming in but instead to block the SMPS from splitting it OUT onto the line. That is the cheap fix to pass some of the CE codes for RF and EMI suppression in products.
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Old 16th May 2009, 12:25 AM   #1077
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Quote:
Originally posted by troystg
Looking at the picture and the wiring again..

I bet he didn't even put them on the IEC input socket!!!

I bet he made his connection at the switch! Those RF shut caps were probably put on by the server manufacturer...


Thinking about it further...

I bet the Server manufacturer didn't even put those caps on to block garbage coming in but instead to block the SMPS from splitting it OUT onto the line. That is the cheap fix to pass some of the CE codes for RF and EMI suppression in products.
You are right I did not put them there. They are on the input socket. The socket and switch did come from the power supply that came with this case. But this case was never used as a server. It was a DVP system computer. They where very high end audio/video workstations for professional installations.

I took a macro shot of the input socket just to put any further debate to rest. Please note that they are both the same part number.

Click the image to open in full size.
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Old 16th May 2009, 09:33 AM   #1078
AndrewT is offline AndrewT  Scotland
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Hi Mike T,
the important part of that cap information is the X1, just before the 400V
Please confirm I have read that correctly.

X rated caps are for Line to Line duty.
Y rated caps are for Line to Earth duty.

You need Y1 or Y2 caps across that socket from Line to Earth.
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Old 16th May 2009, 10:50 AM   #1079
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Andrew,

Below the X1:400V it reads Y2:250V, does that mean they can also be used L-E and N-E ?
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Old 16th May 2009, 11:00 AM   #1080
AndrewT is offline AndrewT  Scotland
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yes,
Y2 is suitable for mains duty, Line to Earth.

Now you can add a third cap from Line to Line.
X2 250Vac, anywhere between 0.1uF and 10uF. The bigger the better.
For UK use, where we have a maximum of 254Vac from the mains, try to source 275Vac X2.
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