babadono Posted February 5, 2016 Share Posted February 5, 2016 Balanced power systems are dangerous What makes you say that? There is no safety ground. If you are going to use one(or worse yet make one DIY) be sure all the outlets have GFI. Most people have unbalanced audio equipment and connect it with unbalanced interfaces. The addition of a balanced power system in these cases will be negligible IMO and not worth the expense and safety concerns. Quote Link to comment Share on other sites More sharing options...
LarryC Posted February 6, 2016 Share Posted February 6, 2016 (edited) CECAA850, on 04 Feb 2016 - 2:25 PM, said: It sounds like you cured your noise issue with the dedicated line. Could you get away with just something for protection? Yup, tired of searching for a non existent item. UHG!!! It sounds like your search is over. I've never used "surge protectors" for audio in over 30 years in my house. I have one on my computer, because (1) it seems more logical there with computer files to protect, and besides, (2) it comes inseparably with the power strip. I'm glad you solved your (so far) only identified problem. Edited February 6, 2016 by LarryC Quote Link to comment Share on other sites More sharing options...
pat_in_dfw Posted February 7, 2016 Share Posted February 7, 2016 My company sells these (or one of the other models in the same line) in every job. http://commercial.snapav.com/p-1686-wb-600ch-svce-12.aspx I especially like the small units that fit behind a flat panel TV or at a projector. For a UPS solution - we use: http://commercial.snapav.com/p-529-ep-400-ups-8htr-1000.aspx Quote Link to comment Share on other sites More sharing options...
Fjd Posted February 11, 2016 Share Posted February 11, 2016 (edited) http://www.audiocircle.com/index.php?topic=18441.0 Interesting little project that I may need to add to my DIY bucket list. The build thread was interesting and seemed to have a lot of good information regarding potential issues and several examples of creative implementations. Essentially, it seems like building a DIY power cord to deliver balanced power and conditioning to one component. . Edited February 17, 2016 by Fjd Quote Link to comment Share on other sites More sharing options...
Fjd Posted February 11, 2016 Share Posted February 11, 2016 (edited) The best way to ensure low noise power is to use an isolation transformer with a center tapped 120V secondary that one ties to ground for balanced power delivery. It's best to use a transformer with a 240V primary to keep the power balanced from the pole. Either that or use a UPS to power audio equipment. A simple power strip type "conditioner" is rarely sufficient to clean up the AC line. Are you sure the interference is power related? The best way to isolate the problem is to put a scope on the incoming power and look for transients. Cleaning up the power isn't going to cure airborne EMI. Can you go into more detail how to wire one of these isolation transformers as balanced? Does it require a transformer that is both 120/240VAC? The secondary should be 120V, the primary can be 120V or 240V. Hooking to 240V keeps the power balanced from the pole all the way to the equipment. The secondary has to be center tapped with the CT hooked to the ground connection on the outlet sockets. The other two secondary wires hook to the H and N connections. With this arrangement there is no H and N. The voltages are balanced: 60-0-60 volts. This arrangement is commonly found in computer rooms, hospitals, and other medical facilities where clean power is essential. UPS units that output clean sine waves are used in some cases where backup power is also required. I’m looking at this Topaz ultra-isolation transformer schematic and it seems like it has dual windings (center tap?) on both the input and the output side. It would seem that this transformer could be wired to take 120V input and split it into two 60V outputs on the secondary side. Summing the two 60V outputs on the secondary side would seem to give the 120V balanced power output. The downside would appear to be a de-rating the kVA capacity by one-half where a 1kVA rated transformer would be de-rated to 500VA. Does the following wiring of the primary and secondary both in series make sense? Input: Neutral (white) to H1 Hot (black) to H4 Ground to chassis Output: Hot 1 (white) to X1 Hot 2 (black) to X4 X2 and X3 center tap connected to chassis ground and outlet ground. However, I’m not sure what, if anything, should happen with the screens (e.g., S1 and S2). Schematic Input side Output side . Edited February 17, 2016 by Fjd Quote Link to comment Share on other sites More sharing options...
Fjd Posted February 11, 2016 Share Posted February 11, 2016 (edited) Here is another creative implementation of a "DIY power cord" that can deliver balanced power and conditioning with three sets of transformers for multiple components from the Felicia build thread. . Edited February 17, 2016 by Fjd Quote Link to comment Share on other sites More sharing options...
dtr20 Posted February 17, 2016 Share Posted February 17, 2016 I use this, and it definitely gets rid of noise. http://www.amazon.com/gp/aw/d/B000SXWGAQ/ref=mp_s_a_1_1?qid=1455731317&sr=8-1π=SY200_QL40&keywords=power+conditioner+5300 Quote Link to comment Share on other sites More sharing options...
Matthews Posted February 28, 2016 Author Share Posted February 28, 2016 Holy Smokes! This thing is a TANK. Richard Gray Power Conditioner, 600S series. Weighs in about 40 pounds. Dedicated circuit with clean power to the tubes ...and look at the size of that power cord Now the wait begins. T12 mono blocks on the drawing board Quote Link to comment Share on other sites More sharing options...
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