Jim, I didn't see your last post until just now; sorry. I guess it must have gone up just a few seconds before my last post.
You've offered lots of good thoughts and suggestions. My only further comment is that while I'm not particularly familiar with magnetic breaker characteristics, I'm skeptical that relatively low order harmonics are to blame. The reason I say that, and I could be wrong, is that I doubt that the inductance of a coiled 50 foot extension cord would be significant enough to have much effect at those kinds of frequencies. Keep in mind that the inherent inductance of each individual conductor (hot and neutral) will be significantly reduced by the fact that the other of those conductors is in close proximity. Coiling will increase the inductance, of course, but it will be multiplying an amount that is much less than if just one of the two current-carrying conductors were present in the cord.
So my guess, and as I say I could be wrong, is that as I suggested earlier there is some sort of higher speed transient that is present, that repeats each cycle and that is being reduced by the extension cord's inductance. Or, alternatively, perhaps the capacitance between the safety ground conductor of the extension cord and the other two conductors is providing some sort of filtering action at high frequencies, or is somehow affecting something in the amp by adding capacitance between the chassis and the AC inputs.
And if a regenerator is to be selected, it would seem preferable to first have as good an understanding of the cause of the problem as possible. Meaning, IMO, that the measurements and experiments suggested by me, Frank, and Jim should be addressed first. Such as the simple ground measurements Frank suggested, the comparison I suggested of results with the extension cord coiled and uncoiled, and the suggestions in Jim's last post.
Otherwise we're taking a shot in the dark. Which we may end up taking anyway, but it would be prudent to minimize that likelihood as much as possible.
Regards,
-- Al
You've offered lots of good thoughts and suggestions. My only further comment is that while I'm not particularly familiar with magnetic breaker characteristics, I'm skeptical that relatively low order harmonics are to blame. The reason I say that, and I could be wrong, is that I doubt that the inductance of a coiled 50 foot extension cord would be significant enough to have much effect at those kinds of frequencies. Keep in mind that the inherent inductance of each individual conductor (hot and neutral) will be significantly reduced by the fact that the other of those conductors is in close proximity. Coiling will increase the inductance, of course, but it will be multiplying an amount that is much less than if just one of the two current-carrying conductors were present in the cord.
So my guess, and as I say I could be wrong, is that as I suggested earlier there is some sort of higher speed transient that is present, that repeats each cycle and that is being reduced by the extension cord's inductance. Or, alternatively, perhaps the capacitance between the safety ground conductor of the extension cord and the other two conductors is providing some sort of filtering action at high frequencies, or is somehow affecting something in the amp by adding capacitance between the chassis and the AC inputs.
08-20-12: SailcappyWhy invest in a power regenerator, and perhaps risk introducing side effects that on occasion have been reported to result from them (such as compromised dynamics), when you already have a solution that appears to work adequately?
I just spoke with my friend who works for the power company and we agreed on the following:
1. Regardless of the problem with my buildings power we know they will not fix it.
2. It seems to me that some type of power regenerator is needed.
3. What do you recommend that just has one input and one output?
4. Should I go digital or analogue?
And if a regenerator is to be selected, it would seem preferable to first have as good an understanding of the cause of the problem as possible. Meaning, IMO, that the measurements and experiments suggested by me, Frank, and Jim should be addressed first. Such as the simple ground measurements Frank suggested, the comparison I suggested of results with the extension cord coiled and uncoiled, and the suggestions in Jim's last post.
Otherwise we're taking a shot in the dark. Which we may end up taking anyway, but it would be prudent to minimize that likelihood as much as possible.
Regards,
-- Al