Help! I'm trying to fix a Trace Elliot 250 watt combo (gp12 smx). There seems to be no power going to the pre amp. It did a similar thing a couple of weeks back and replacing the tube did the trick. Not this time though! I've tried about 10 tubes (all of which I know are good). There is a 10 watt aluminium bodied resistor (470 ohm) mounted on the power amp heatsink which I have noticed is getting pretty hot. Anyone know how hot these should run normally (warm,hot,very hot?) - this is so hot that you could'nt touch it. Anyone got a schematic? All help gratefully recieved!