Tube Phonostage Causing Rumble and Noises

@OP You indicate that there is no rumble when the Aexthetix phono stage is played via your Apogee. It's not impossible that the sub is reproducing frequencies that are below the bandwidth of the Apogees.

In terms of fault finding, you should borrow an alternative phono stage from your dealer - preferably solid state.

If that eliminates the problem then you know that the issue is interaction between the turntable/sub/phono stage.

Tubes are microphonic and the IO is relatively unusual in using tubes for all of its gain so the issue is, pardon the pun, amplified.

You need to use a subsonic filter. Many of us use them. They operate below human hearing and will solve your problem. @stereo5  was kind enough to offer you one to try. You should do it as your next step and potentially save yourself a lot of grief and expense. Springs won’t fix this. 

Do you have a modem or internet satellite (like an Orbi) close by?  I notice that my phono pre-amp meters have activity when the Orbi satellite is close by.

Hi Noromace, not in use means not playing and still connected to the select source.

my turntable is far away from a corner and the sub is at least 5 ft from the turntable.

At this point, I probably should try the rumble filter. I will give KAB a call tomorrow to get more info. Stereo5, did you mean RF-1 because I don’t see RF-5 on KAB website.

I appreciate everyone’s advices and help. Thank you all.

Do your tubes have tube dampers? It probably won't cure the problem you are having, but if the issue is microphonic tubes, damper rings may help.

Another thing to look at. A friend of mine had a terrible noise issue with his phono stage. It was later discovered to be a bad dimmer switch on the same AC circuit. You should try plugging the phono stage into different outlets to see if this is a noisy power issue.