Up above in this thread, someone suggested experimenting with the physical orientation of your external SUT in relation to the power transformer of your Lamm phono stage. In addition to playing with grounding, have you tried that yet? There is a possibility that will make a difference. Also Jensen Transformers are very very good. I am surprised you find them to be inferior to even a low priced external SUT. Perhaps Lamm does not use the top of the line transformers available from Jensen. You might consider replacing the Jensens in your unit with the best current Jensen SUT.
