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In Reply to: RE: Update posted by H5011 on March 18, 2010 at 11:45:14
The last time I tried running things off of one of the undedicated AC-lines, I had Monarchy SM-100 Deluxe monoblocks that hummed like crazy in both my dedicated rig, and at the opposite end of the house -- and never did with their previous owner and never have since I sold them to someone else. So the test of hooking them up to the undedicated line didn't fix the problem, but it wasn't exactly the same problem, either.
The simple one-box receiver with no TV, etc., still degrades over time, sonically, in much the same ways as the problem I describe in my OP, though. In particular, running the speakers with a receiver and no sources (including the TV) hooked up, I get the same problems. I even get the same problems with all the other breakers turned off.
Follow Ups:
The Monarchy site does not have pictures or other mention of this model.
There are two ways to cause toroidal transformers to hum: to present them with severe harmonic distortion (DC on the AC) or to apply excessive voltage to them.
If you use a DC blocker and still have the problem, then how sure are you that your line voltage is correct?
If the neutral wire has a bad connection at the utility transformer, your line voltage will be increased whenever you or another customer that shares the utility transformer draws current on the opposite leg. Even in a normal situation, any shared resistance on the neutral will cause a slight increase in voltage. If you see more than a few volts of difference over time, call the utility company and ask them to check their transformer.
I know it's been a long time putting up with this; I appreciate it. I can ask the local utility (which is a municipal, btw), to check their transformer for this problem -- and I have a few add'l pieces of info to relay under this heading:
1) The breaker box on the outside of the house is brand-new, together with the dedicated ac-line that runs the rig, but the ground resistance came in at a whopping 15 ohms, so the electrician took the end of the copper wire running to the ground stake and tied it to an outside water pipe. The problem existed before and continues now, without much or any difference, but I'm wondering if grounding the house's wiring to an outdoor spigot isn't a non-audiophile-approved fix for excessive ground resistance.
2) In attempting to produce the scientifically constructed data-plot suggested by another member, I removed all forms of power filtration and plugged various pieces directly into the wall, whereupon I discovered that the "kee-CLACK" sound made when I connect or disconnect the TV from AC will periodically emanate from inside the TV while it's just sitting there, but interestingly only once at a time -- even though the sound is usually associated both with connecting and disconnecting the TV.
To my knowledge it hasn't done this before, when connected to the isolation transformer and/or the common-mode choke, but I could be mistaken; it could do this periodically and I just haven't been exasperated enough to notice before now.
Does this point a flying fickle finger at some specific form of fate, or is it just another oddity that never happens on earth, but does happen inside my house?
I don't think it explains your audio problems, but it is dangerous and should be corrected by an electrician who understands the situation.
Have you measured your AC voltage and looked at it over a period of time?
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