Update....  Figured out the base noise hum is coming from the power transformers,  not sure if its cause they are old or junk or what.  Bigger question is where to get a replacement.  Anyone got any ideas?

alot of good info thanks.  I forgot to mentio  the sound clip was just the amp at no volumes and nothing in the loop.  If you are telling me that is normal than I'll roll with it.

this is the noise with both gains and masters at zero.  its a little quiter with everything atzro but not much

I could see that being the issue.  Makes sense,  problem is wanting to utilize the loop because the eq sounds better in the loop than in the front(minus the noise of course).  I have been running a wet dry setup and maybe just gonna have to run that with everything out front unfortunately.  Thanks for all the suggestions guys.

little or no change.  the problem gets worse if you plug in a rack mount component (i.e.  alesis quadraverb or rane pe 15)

I will do that,  thanks

Its a hum

ok, finally got a chance to try it and no dice. Same results. Soon as you turn it on it has a hum in the speaker.

I read about doing that and didnt think to try.  I will do that when I get home.  thanks for the suggestion

I forgot to add the noise is present with nothing in the loop, just not as bad. The loop amplifies it.

I have a RG100HT, RG100ES, RG80-112SC and a RGT100ES and all of them make an overly noticeable amount of white noise when you plug effects into the loop. As soon as a plug goes into the effect send actually. I have a rack mount power conditioner that everything is ran through and it is less noticeable with an effects pedal(boss ge-7) as opposed to a rack mount piece(Alesis Quadraverb, Rane pe15, BBE sonic maximizer). If I run it through my Hush IIC I can get alot of the noise out but only if the gate is cranked all the way up.  The only other amp I have to check these against is a tubeworks power amp which makes no noise but also has no loop because its a power amp. My next step is going to be to make my own cable set for the rig. Aside from that, maybe the grounds in the house I live in are garbage. Also if I plug any of the effects in, in front of the amp there are no problems. The sound of the eq in the loop as opposed to in front is better imo so I would like to figure this out. I'm missing something. I find it hard to believe 4 different RG series randalls would do the same exact thing. Any info is greatly appreciated, Thanks