[Bob in St. Louis]

Call Amren.
Ask them what's the maximum you should see.

Bob

[Joe_K]

Welcome aboard David,

Some thoughts, at the risk of being redundant,

After double checking that everything is on one circuit, as Scott suggested, if the hum is still there I would disconnect and unplug the computer / music server / cable feed / network etc. from the stereo and see if the hum disappears.

If the amp has some DC offset, it can cause the thump / pop too!

If you’re having an electrician out, I would have at least one, if not two dedicated 20 amp lines from the same phase run. I would also consider having it done with a minimum of 10 gauge wire. A couple or more outlets on each line spaced about can be useful. ie powered subs one wall / mono blocks near speakers / equipment rack wherever, etc?

Dealing with Ameren?  Electrical items should be able to tolerate at least a +/- 10% variance in voltage. The question is what’s the nominal voltage?  117vac + 10% = 128.7, 120 +10% = 132 could the power center be out of cal?

I had Ameren out for when my or my neighbors AC kicks on the lights blink in both our houses, it’s annoying. I put the call in last year just before the big storm. Anyway,  a couple of Ameren people came out checking for damaged wires from the storm and basically told me my condition is normal and all houses do it. Wrong! There’s either an undersized transformer or some resistance in line! My previous home did not do this! I may take up the fight again as AC season rolls in?

My point is you may get farther if your electrician can find something! Although I know people who claim their systems sound better late at night. Among other things, line voltage is usually higher at night!

 
It'll all come together and be worth it!
Keep us updated,

Joe

[dcfour]

Joe and all.  Indeed I think when I get my electrician out here I'll start to get some answers.  I did check my voltage with a hand held meter, especially when the Monster PC was spiking.  It matched exactly.  And ran through the whole house and it was the same everywhere. 

I have a 90 year old house that has been added on too and redone and etc., etc.  Still have a combination of newer breakers and screw in fuses.  The basement looks like a high school experiment in "how electricity works!"  We will see.

BTW.  Want to get a tuner for my system.  Regular listener to 88.7 and would like it at home, but need something that can pull it in.  Love the look of old analogue tuners, Mac and Marantz.  Reminds me of my youth listening to KSHE.  Any thoughts on where to pick something up cheap?  Tax time still hurting.  Thanks again to all.  David

[doug s.]

Joe and all.  Indeed I think when I get my electrician out here I'll start to get some answers.  I did check my voltage with a hand held meter, especially when the Monster PC was spiking.  It matched exactly.  And ran through the whole house and it was the same everywhere. 

I have a 90 year old house that has been added on too and redone and etc., etc.  Still have a combination of newer breakers and screw in fuses.  The basement looks like a high school experiment in "how electricity works!"  We will see.

BTW.  Want to get a tuner for my system.  Regular listener to 88.7 and would like it at home, but need something that can pull it in.  Love the look of old analogue tuners, Mac and Marantz.  Reminds me of my youth listening to KSHE.  Any thoughts on where to pick something up cheap?  Tax time still hurting.  Thanks again to all.  David

thank lonewolfny for sending me a link to this thread - he knows i am the resident tunaholic.   

mac s/s tunas sound like shite, even if you could afford them.  the tubed macs sound nice, but are also quite expensive, and there are others that sound better for a lot less coin - think sherwood.  none of the tubers are noted for their reception abilities, but the sherwoods are decent for tubes.  there are a few wintage marantz tunas that sound nice, but they are again expensive, and reception is not their strong suit.  (think marantz 20 or 20b)

if you are wanting inexpensive, wintage analog look, good sound & reception, you can't go wrong w/a sansui tu517 or tu717.  these tunas are practically identical, w/exception that 717 has a record calibration tone switch.  both are excellent looking, excellent sounding, excellent reception.  spend money on one getting it refurb'd/modded, and it will be near as good as it gets.  coincidentally, there's one in my rig presently, stock, never serviced, and it is still cranking out the tunes - big soundstage, nice tone, extended, only giving up a smidge of detail/transparency compared to the wery best.  (there are presently ~50 tunas chez-sedon, so i switch them out occasionally.)

go here, if you want more tuna info:
http://fmtunerinfo.com/

doug s.