With that typed, I was ASSUMING that a 20A breaker should not only be in front of, at minimum, 12 gauge wire, but also a 20A breaker.

@jea48 thanks for getting back to me. The above was a bit of a typo that I can no longer correct on the post it was posted to, I meant that I was ASSUMING that a 20A breaker should be in front of 12 gauge wireand a 20A outlet.  But I'll leave that alone for now.

The duplex receptacle came from Lowes and were therefore nothing special.

Cover plate is plastic.

I installed the breakers myself and I put them on the leg the window AC and the drier and the kitchen is not on. 

I JUST NOW went to my panel to refresh my memory.  On the leg that I put those THREE DEDICATED LINES on, there are only three other breakers.  Two of them (and this may be confusing) are for TWO OF THE THREE dedicated lines I put in 25 years ago.  I have been up in the attic working with them and they are now going to be three dedicated lines in my living room.  Meaning they will basically not be used for anything or be used infrequently.  So I don't see a problem with them, and, as a matter of fact, when I finally finish up in the attic and hook them up to their three breakers, I can turn them 'off' and they will definitely be out of the picture.  There is one other breaker on that leg, and I just turned it 'off' and did a walk through, and for the life of  me, I canot find anything that isn't working!  And this is a small house!  So I am leaving 'off' as well (unless I accidentally figure out what it powers) , and it should be out of the picture.

I was thinking about putting them at the bottom of that leg, and now I don't know why I didn't.  I think I left myself enough Romex available in the attic that I can move them down and block off those openings in the panel.  But now, after that last paragraph I just inserted, I am thinking that I probably don't need to?

I can check voltage with a MM, anyway.  I am assuming to select AC volts on the MM for that.

I have one more session up in the attic (I keep saying 'just one more) (this is NOT a fun attic to work in) and then some rerouting at the panel itself, and then I can put my listening room back together (the panel actually resides in that room and I am also using that room as a staging area of sorts for all the work I am doing, therefore crap is all over the place in there) and then I can start listening, as you suggest, and try to make some determinations.

Thanks again for getting back to me, you are always most helpful.

@erik_squires   thanks for getting back to me.  Only 4 things will be on these/this circuit(s).  My SA10 SACD player, my pre, my amp and my powered sub.  So going by your above post, nothing really needs to be segregated from anything else?  And I did go to the link you had for surge protection . . . my memory gets shorter every day, but I believe that was the Tripp Lite?

@jea48 thank you for the added input. A couple of things with a question(s) added:

About my breaker arrangement on my panel:

I typoed again in previous post. There now are FIVE breakers on the leg I used for the 3 circuits I just added.

From the top working down

1) I discovered what the unknown breaker was for. The washing machine. Which I assume is a pretty hefty draw? However, I am relatively confident that the machine is usually not in use when I am listening. So that should be good?

2) In my previous post, I said "TWO of the three original dedicated circuit breakers were on that leg"; in reality, only ONE of those breakers is on that side, and when I finally reach completion up in the attic it will be very rarely in use. So that should be good? If not, I can turn that and the washing machine breaker off when listening.)

3, 4, and 5 are my for the new and truly dedicated lines that I ran directly from my outlets, up the wall, across a section of the attic, and down into the panel.

Besides the sub-questions I raised above, 1) would you say that what I have described make that a pretty good leg? 2) Especially if I turn those other two breakers on the leg to ’off" when listening? 3) And is there any need to do that if those circuits are not being used when listening? 4)And would there now be a need to move my three new breakers down?

(I guess that was more than one question.)

On the outlets: thanks for providing that, and I actually did buy some of that brand at Lowes.. I know because I have a n extra one. The back strap is magnetic. However, I also have them mixed & matched with another brand Lowes sells (I don’t have the box on that one), and it has a magnetic back strap as well. I am pretty sure that they are different brands as there are small differences in their construction. I can easily go to Lowes & finish up this job by buying all one brand.

Anyway, thank you for your helpful input.