Hi, I had the same happen to me when I used a SR Kalidescope i/c with active shielding, when I used it between my tt and phono stage. It went away when the active shielding was unplugged. I tried different things, such as turning the plug 180 in the receptacle, to no avail. Just used it without the active after that. The signal from the cartridge is so miniscule, it is not conducive to using the active shielding, IMHO. I have since moved my table, and had to go with 3 meter i/c's, and got the Tesla Vortex Analog, and it comes without active shielding. It has a ground on it, but I didn't use it, as this run was between phono stage and pre-amp, so running the ground would be risking causing a ground loop. I use a .5 meter pair of DH Labs Air Matrix Silver a/c from tt to phono pre, and have no hum problems. Whatever you use between tt and phono stage has to be well-shielded, and the active shielding on SR products is not a good fit in this application, I don't believe.
Best of luck,
Dan
