Leave the tuner on and the integrated off. Won't hurt the integrated at all.
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"Break In" is not a proven audible or measurable phenomenon. The perception of changes in sound quality with time is likely attributable to the classical placebo effect, i.e., a listener anticipating a possible audible difference is predisposed to hear one whether or not it exists. Note that almost all exotic cable vendors claim cable "Break In". This is actually quite a popular myth touted by many other exotic cable vendors and cable forum cult hobbyists alike.
cable break in just a ploy for getting people to keep the cables beyond the return period, or perhaps long enough that their desire to do anything about the lack of any improvement is gone....
comb filtering is the most plausible explanation for many of the differences people claim to hear from cables, power conditioners, isolation devices, low-jitter external clocks, polarity reversal, ultra-high sample rates, replacement power cords and fuses, and so forth. Comb filtering is a specific type of frequency response error that occurs when direct sound from the loudspeakers combines in the air with reflections off the walls, floor, ceiling, and other nearby objects. Ask yourself, do I sit in the same spot every time? The answer will not surprise us because it most likely is NO.Unless you strap yourself in your chair and its bolted to the floor we do not always sit in the same place.This just might be the reason for comb filtering, moving even a tiny distance changes the response by a very large amount at mid and high frequencies..
I can't see how just leaving the tuner on but not have the amp running will break in the cable. It will not be performing any function will it?George (Xti16) is correct, Stan. The input of the amp will "look" essentially the same to the cable and to the tuner whether the amp is on or off. The amp's input impedance, and therefore the amount of current that is drawn through the cable from the tuner, will usually be determined to a close approximation by a resistor (perhaps 47K ohms for a typical unbalanced input) that is connected between the amp's input terminal and ground.
Disclaimer: No opinion about the value of break-in is expressed or implied in this response :-)