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Old 4th July 2011, 06:24 PM   #281
BigE is offline BigE  Canada
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What an incredible setup. Obviously, I am in a disadvantaged position.... it is pointless for me to change anything. I shall go back to the copper signal wire, and repair the grounding.

I should spend some time making my setup look more like that setup. (A Technics Sp10 in a panzerholz/birch plinth is on the way, probably with the Benz Glider SL. Arm, as of now, is undecided.).
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Old 5th July 2011, 04:52 AM   #282
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Update: I changed the signal wire to Legenburg upocc copper from Mundorf Silver/Gold 26awg.

The difference is enormous. The Denon 103D is ok now.

Don't use silver wire -- with silver the sound lacks body.
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Old 5th July 2011, 03:49 PM   #283
fmena is offline fmena  Canada
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Default Ground points

I have a similar problem in that as I turn up the volume I get more hum.

Presently I have the AC-IN and Turntable ground connected to a single ground- post on the chassis. I was wondering if I could connect the GND points I have coloured in red (see attachment photo) to the ground post mentioned above.

Also Peter mentions in Post 180:
You may try connecting wire from TT to the common PS ground at C4/C5.

Where in the heck is the common PS ground at C4/C5 on the PCB? Could someone spell it out for this dummy?

Thanks in advance.
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File Type: jpg pcb-phono groundpoints.JPG (250.0 KB, 481 views)
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Last edited by fmena; 5th July 2011 at 03:51 PM. Reason: Cut instead of copied text
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Old 5th July 2011, 04:02 PM   #284
BigE is offline BigE  Canada
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Sure. I used a speaker post, but make sure you can solder to it. There is no connection to the chassis.

Also, I connected 3 holes over, to where the capacitors join -- the grounds you have labelled connect to the same place.
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Old 5th July 2011, 05:11 PM   #285
BigE is offline BigE  Canada
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FYI: C4 and C5 are on the PHONO board side, not the PS supply side.
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Old 5th July 2011, 05:30 PM   #286
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Quote:
Originally Posted by fmena View Post
Where in the heck is the common PS ground at C4/C5 on the PCB? Could someone spell it out for this dummy?
It's the trace that connects pins of both caps, as indicated in attached pic.
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File Type: jpg ground.jpg (34.9 KB, 457 views)
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Old 5th July 2011, 07:15 PM   #287
Carlp is offline Carlp  United States
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As to hum, it looks to me like the mains ground leg is tied to one of the mounting posts, which might, depending on the build, also connect to the chassis. If you have another ground point tied to the chassis elsewhere, you've undone any "star" like grounding AND created the possibility of current flowing in the chassis and hum deriving there.
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Old 5th July 2011, 08:55 PM   #288
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Yes, the ground post should be isolated from the chassis and connected to the point indicated in my previous post.
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 6th July 2011, 02:53 AM   #289
BigE is offline BigE  Canada
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After fixing the ground and putting in the legenburg 24 awg equivalent copper, the unit sounds great.

Thanks Peter!
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Old 12th July 2011, 02:03 AM   #290
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There are 80+ hours on the Vcaps and it's sounding better and better all the time. This is a long, but worth it, break in period.
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