ART 13s did have some harmonster problems back in the early days of TV, but that is rarely the cast any more. You are missing out on a lot of fun by letting yours sit. Watching that autotune do its thing is better than than "tuning up" one of the rigs fromacross the western pond! The audio on the ART-13 is not to be believed. Grab your power supply and get going.
73, John, W4AWM