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Old 21st April 2010, 12:03 PM   #1331
Salas is offline Salas  Greece
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I ask because I think it would drop THD.
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Old 21st April 2010, 01:23 PM   #1332
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Nice choice. Did you listen to it yet? Again, at what current you set it?
Just hooked it up to my Aleph 5 (pics later) and I'm very impressed. First impression is that it's very clear and well balanced. Will have to let my Aleph really warm up before a true test.

Current? Give me a quick hint and I'll check. Again, all I know for the moment is I built it to the specs listed in v4.3 BOM. After a quick review of the this thread I thought the CCS current was set by R1 in your schematic. Thus the reason for the two 68R's in parallel. Correct?

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Dan
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Old 21st April 2010, 02:55 PM   #1333
Salas is offline Salas  Greece
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Since you got ample sinking in the way you mounted the Mosfets on a thick metal box, you may rev up the CCS current by using a combination for getting R1 down to 11R 3W. If you check voltage across R1 divided by its net Ohmic value you know your now current. Will be nice to mod and compare after you listen to it as it is for a while. The low current is for those who don't have space for sinks and/or want the consumption low. The quality is very nice as standard 68//68R. But picks up noticeably if you push the CCS.
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Old 21st April 2010, 04:40 PM   #1334
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Since you got ample sinking in the way you mounted the Mosfets on a thick metal box, you may rev up the CCS current by using a combination for getting R1 down to 11R 3W. If you check voltage across R1 divided by its net Ohmic value you know your now current. Will be nice to mod and compare after you listen to it as it is for a while. The low current is for those who don't have space for sinks and/or want the consumption low. The quality is very nice as standard 68//68R. But picks up noticeably if you push the CCS.
I have two Mills 10R 5W that I'll pop in later today.

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Dan
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Old 21st April 2010, 04:46 PM   #1335
Salas is offline Salas  Greece
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Will be interesting to know if you will agree with the other builders. Happy testing.
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Old 21st April 2010, 09:58 PM   #1336
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Will be interesting to know if you will agree with the other builders. Happy testing.
Slipped in the 10R's in and everything appears normal. DC offsets are the same. Voltage drops. Does 2.38VDC and 2.04VDC sound reasonable?

Regards,
Dan

Last edited by dantwomey; 21st April 2010 at 10:19 PM.
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Old 21st April 2010, 10:02 PM   #1337
Salas is offline Salas  Greece
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What kind of trouble, probe non reach? Is it getting hotter on the Mosfets at least?
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Old 21st April 2010, 10:21 PM   #1338
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What kind of trouble, probe non reach? Is it getting hotter on the Mosfets at least?
Sorry, edited my post with measured values.

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Dan
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Old 21st April 2010, 10:24 PM   #1339
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Thumbs up almost done

Here's my build so far...

Just need to wire up a power switch (to the front or back panel).


Click the image to open in full size.

Click the image to open in full size.


hmm, led strings are not quite what was recommended (1.8v drop each).

Other than that, I'm really happy with the build. Most difficult part was drilling out a square hole for that IEC inlet.

Next build I'll hopefully find something that is pre-drilled.

Last edited by merlin2069er; 21st April 2010 at 10:25 PM. Reason: grammer
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Old 21st April 2010, 10:44 PM   #1340
Salas is offline Salas  Greece
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Slipped in the 10R's in and everything appears normal. DC offsets are the same. Voltage drops. Does 2.38VDC and 2.04VDC sound reasonable?

Regards,
Dan
Yes its in the region. Depends on individual mosfets Vgs. If you keep it in the end, find a 12R for the 2.38V side so to match the other for current.
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