I got that from a Harmony-Central review (http://www.harmony-central.com/Guitar/Data/Hartke/3500_Head-01.html). I've searched the Amp forum a few times, but have never found this complaint at TB. I'm assuming either 1) The HC reviewer (there were more than one) had bad luck or got a bad year of Hartke (is that possible?) 2) The HC guy is just really picky 3) I didn't search the forums enough. Since I'm looking at getting the 3500 (or the GK400/700), I hope this thread will be nice and short, i.e. "No problems here!" But better get the answer here than after I've bought the amp! Thanks a lot!!!