Yesterday i picked up a lovely AH250 GP12 SMX. This prompted me to do some research and found some info that related to one of my other Trace heads - an AH300 GP7 SM that I picked up off here some years ago. I've used it a few times, no problems, bags of power and not too heavy. Apparently, some of these amps have a power amp called the 'Bipolar Bear' - easy to spot as it's written on the board and has two big heatsinks that are easy to spot. Apparently this board can be troublesome and as