Hi, I just noticed this amp changed a bit this year. There use to be 6 leds at the rear side to indicate tube failure. For 2014 they just replaced that asset with 2 bias pots. I find it stupid to let the user change bias value, most people do no have the tools or knowledge to set bias properly. Those pots should be hidden inside the amp or am I missing something? I saw that on a german website, the official website still refers to the previous model. So I have no official explanation about this new asset. Anyway i just ordered one of these, I'll let you know how it sounds.