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Hypex NCore NC500 build
Hypex NCore NC500 build
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Old 1st January 2018, 10:42 PM   #1711
barrows is offline barrows
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Default Seems...

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Originally Posted by maty tinman View Post
RF/EMI filter and thick aluminum walls too. I like the inside case!

Stage Two What next to power the dirty audio addiction?

Click the image to open in full size.
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, 01:43 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.

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Originally Posted by maty tinman View Post
Abrahamsen v4.0 inside, transformer:

Click the image to open in full size.

Steel sheet or maybe graphite around the transformer, or both.


If you buy a graphite sheet, you can add under the sides too. 1000 VA toroidal transformer can be very problematic you know.

Last edited by mocenigo; 8th January 2018 at 01:46 PM.
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Old 8th January 2018, 02:15 PM   #1713
maty tinman is offline maty tinman  Spain
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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 02:21 PM.
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