TV and Tube gear.

I have a Jolida integrated amp and I would like to use it with an older Mitsubishi TV. I tried connecting the TV into the AUX input of the Jolida and this created an audible rumble.

Is there an inexpensive device to correct the problem?

Is there a tubed AV pre-amp/line level that I can insert between the Jolida and the TV that will cure the compatibly problem?