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Old 1st January 2009, 09:16 PM   #2471
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I give up. Everything is done right now. Anything more might be impossible due to the endless soldering corrections from having to piece how to actually get this thing right. (Peter as helpful as you are I think maybe just some nice PDF's put together would be easiest for you and people building) The DAC I might try to have a professional reverse the polarity on the NX and replace the Dale with Caddock.

Some day I will maybe order a new set of PCB and components or just try a different amplifier.

I will say the noise is loud as hell now though, when nothing is playing, I mean like I do not have to put my ear to the speaker.
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Old 1st January 2009, 09:29 PM   #2472
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The RCAs should be isolated from a chassis. Do you have the chassis grounded?

Guidance provided in this thread should be sufficient for anybody building those amps: Commercial Gainclone kit- building instructions
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Old 1st January 2009, 09:33 PM   #2473
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Default Re: Custom USB cables count

Quote:
Originally posted by wlowes
Let me under underscore value of short cables.
You may also consider bypassing R5/R6 (20R) in USB DAC. I did that in my unit and things seems to be more "clear" now.
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Old 1st January 2009, 11:35 PM   #2474
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Yes the Chassis is grounded. However there is no connection to earth ground. (I am a renter, not sure what I can do about it) The AC recetpicle does however have the backstrap.

I re-read what you posted, I am digging into my amplifier, again.
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Old 2nd January 2009, 12:31 AM   #2475
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Back to before. I guess it must be without R1 I get the RF.

The question is am I better off without R1 sonically or better off without RF... I really like the sound without it.
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Old 2nd January 2009, 12:49 AM   #2476
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I think I have solved the entire problem.

http://www.diyaudio.com/forums/attac...amp=1200627976

I just need to connect the grounds on the RCA jacks... I think, I will try it.
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Old 2nd January 2009, 12:49 AM   #2477
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Well, it's up to you to decide: R1 is rarely needed and without it, the sound is slightly better, but having RF can be annoying. You could try installing there Vishay S102, it sounds better than Caddock, in this position.
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Old 2nd January 2009, 01:28 AM   #2478
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Well after looking at the information for awhile I decided that...

I should connect the SG from one channel to the other. Then connect the RCA's together.

Well wrong. The channel that no longer has SG connected straight to the PCB, well that channel I can tell that I just listened to Californiacation by Red Hot Chili Pepppers on...

The whole situation is leading my to believe there is a ground loop happening though. It would explain why some sources RF occurs with and others do not.
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Old 2nd January 2009, 02:06 AM   #2479
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I have come to the conclusion it is impossible to remove this loop. So long as you have the grounds connecting in any fashion inside the amplifier or source, it will exists.

However if you where to only use ONE ground in ONE RCA cable, for both, you would eliminate this loop...
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Old 2nd January 2009, 02:37 AM   #2480
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That does not work either. At least my RCA was not long enough to fin out possibly.

Back to the old way. Enjoy the RF I guess.

Peter do your dual monoblock or any amplifiers that have dual power supplies ever pick up any RF without R1?
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