My 317 continually blows the 250v 2.5amp fuse. This occurs a few moments after the unit is switched on. I have replaced the fuse a number of times but the same result. The relays for soft clipping and bridging (I'm unsure of their precise use but the the indicator lights for these function light up momentarily but then the fuse blows. I am using the correct size of fuse and correct voltage. The 250v 100ma fuse remains intact. Can anyone give some ideas and to the cause of the problem. Regards Neil Spencer