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Hypex NCore NC500 build
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Old 1st January 2018, 09:42 PM   #1711
barrows is online now barrows
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Default Seems...

This seems to route the speaker cabling together with the input wiring, not the best solution, especially considering the expense and attention to other details in this case?
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Old 8th January 2018, 12:43 PM   #1712
mocenigo is offline mocenigo  Germany
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The biggest problem with the toroidal is that there is flux leak where the cables go in and out. The transformed should have been rotated away from the circuitry, and indeed the hum is higher in the left channel, the one closest to the transformer.

It is not a real problem, since even with my relatively sensitive speakers there is no audible hum 60 cm from the speakers. I can add g-iron or graphite around the transformer but I am in no hurry.

The transformer itself is of very high quality, it is one of the most silent and vibration free I have even had in any audio equipment. Those used by Naim and Pardo were both smaller and noticeably noisier (mechanically).

Roberto

PS: the pic you linked is actually a 2.0 UP integrated. The difference is that you can see the two little pre amplifier boards with the resistor/relay based attenuation modules. They are not present in the 4.0 UP power amp.

Last edited by mocenigo; 8th January 2018 at 12:46 PM.
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Old 8th January 2018, 01:15 PM   #1713
maty tinman is offline maty tinman  Spain
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Quote:
Originally Posted by mocenigo View Post
The biggest problem with the toroidal is that there is flux leak where the cables go in and out. The transformed should have been rotated away from the circuitry, and indeed the hum is higher in the left channel, the one closest to the transformer...
One of my cheap tweaks: wrap the wiring with plumbing teflon and then the cover of a thick power cable.

Old picture, without the transformer shield with steel sheet. Look how close to EI transformer some cables were!

Click the image to open in full size.

Plumbing teflon:

[IMG] http://www.rmmcia.es/sites/default/f..._4100-r800.jpg

Last edited by maty tinman; 8th January 2018 at 01:21 PM.
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Old 8th February 2018, 12:56 PM   #1714
mocenigo is offline mocenigo  Germany
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What should the plumbing teflon the the outer layer of a thick power cable do? RF/EMI shielding?
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Old 8th February 2018, 01:02 PM   #1715
Julf is offline Julf  Europe
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Quote:
Originally Posted by mocenigo View Post
What should the plumbing teflon the the outer layer of a thick power cable do?
Make it easier to clean off grease stains? It has no electrical function.
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Old 8th February 2018, 01:58 PM   #1716
maty tinman is offline maty tinman  Spain
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As seen in the photo, some cables are very close to the transformer.I put teflon and the cover there and I noticed improvement. Then I did it with the rest of the wiring and I did not notice any improvement.

It is cheaper and faster than replacing with audiophile cabling

After I I put a steel plate on top of the amplifier and new improvement.

[IMG] http://maty.galeon.com/WP-imagenes/h...cker-x4-ME.jpg

Later, a piece of steel to attenuate the side radiation of the EI transformer, noticing a new improvement.

Cheap tweaks always.
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Old 8th February 2018, 02:03 PM   #1717
Julf is offline Julf  Europe
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Interesting, considering teflon, PVC and rubber don't provide any magnetic shielding at all.
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Old 8th February 2018, 02:05 PM   #1718
pieter t is offline pieter t  Netherlands
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This stuff has considerable psychological strength...
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Old 8th February 2018, 02:06 PM   #1719
maty tinman is offline maty tinman  Spain
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Maybe the gap increased a little (cover and greater separation) it was the cause of the improvement.

If it was psychological, I would also have noticed improvement with the rest of the wiring.

Last edited by maty tinman; 8th February 2018 at 02:09 PM.
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Old 8th February 2018, 02:10 PM   #1720
mocenigo is offline mocenigo  Germany
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Quote:
Originally Posted by maty tinman View Post
As seen in the photo, some cables are very close to the transformer.I put teflon and the cover there and I noticed improvement. Then I did it with the rest of the wiring and I did not notice any improvement.

It is cheaper and faster than replacing with audiophile cabling

After I I put a steel plate on top of the amplifier and new improvement.

[IMG] http://maty.galeon.com/WP-imagenes/h...cker-x4-ME.jpg

Later, a piece of steel to attenuate the side radiation of the EI transformer, noticing a new improvement.

Cheap tweaks always.
Yeah, but if you had put, say, some aluminium or copper foil in between and then a wire from there to the chassis ground, then I would have imagined something.

Of course there is always capacitive coupling between two conductive materials with some space in between, so also between a cable and, say, anything else. So by adding teflon and PVC tubing you are changing the dielectric, and thus the capacitance. But I would be extremely surprised it did anything.
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