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You have a ground loop no need to change cables or gear yiu need a 30 cent cheater plug
We have a lot of experience here this occurs when you bridge two differebt ac locations by connecting gear plugged into two different electical sources
To test get a long extention cord and plug it in ar the first location and run to the second if the noise goes away u have verified a ground loop
Dave and troy
Audio intellect Nj
You sound like a great user case for the Benchmark class "G" AHB2 amp and their preamp. This setup is well within your budget at about $6k for both depending on whether you get the phono or non-phono version preamp. You will certainly get absolutely zero noise and hum but the big question is whether you will like their transparent detailed sound and how they match up with your speakers.
Pro’s of this system is you get perfectly matched equipment and professional level balanced circuits.
@gordon I believe the issue is the synergy between the Innamorata and LS100. They are both fine operating with other devices, but together not so good. Upscale Audio has a page discussing tube preamp hiss and says it is often a combination of low preamp gain and low input sensitivity for the amp. I believe this could be the issue.