|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
100.14.7.245
In Reply to: RE: Isolation Transformer For Digital Sources? posted by knewton on June 25, 2016 at 05:48:57
Ken, I appreciate your time and you may be right about having a preamp issue. I bought the pre new in January and it has been modded. Gain has been lowered to match the high gain of my SS amp and a 6dB pad added for the gain of the ARC CD. Higher quality pots replaced the stock. I have to believe that Ralph would not let a unit leave his shop with any tech problems. He even setup the preamp and tested it using a SS amp.
I have rolled the tubes, but I can check again, and I do own a small line stage.
I'm certainly not dismissing your diagnosis, since it was done very thoughtfully and methodically.
The fact that when I ran the digital from the separate AC line for a few days and the offending noise was eliminated still makes me wonder if isolation would work. Also, the use of the Tripp-Lite power strip did provide some periods of noise-free use of my system.
Follow Ups:
This may not be relevant but I just eliminated a 7.5 kHz intermittent pulse of about 10 db by changing the balanced XLR cables to a model that may be better shielded. I had this same problem with different sets of equipment and i think in both instances it was due to poorly shielded interconnects. The ones i needed to replace were not cheap and are generally well reviewed. The interconnects were between a tube preamp and SS amp.
motberg,
That's an interesting thought regarding my issue. I've substituted many ICs from the various digital, but never tried swapping out the preamp to amp IC. (It's unbalanced).
Lowrider, you're welcome.The fact that the noise went away when using different power outlets may not be as significant as the fact that it later returned. Which may mean that the temporary absence of the noise was simply coincidental, possibly being more correlated with the simple fact that the components had to be powered off in order to switch them over to other outlets, however, it's really difficult to say anything conclusive yet.
Definitely insert that back up line stage in place of the Atma-Sphere unit to see whether the noise is affected. Good luck.
_
Ken Newton
Edits: 06/26/16 06/26/16 06/26/16 06/26/16 06/26/16
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: