I was playing through my 2061X for quite a few hours today and this evening I turned it back on to play and after a few minutes it just shut down. I checked the fuses. The HT fuse is fine but the main fuse was clearly blown; brown discoloration in the fuse. I went to radio shack and they had the replacement fuses. Exactly the correct type; 1.6 amp 250-Volt. I put a new one in but the amp still doesn't turn on. No light nada. Any thoughts what could cause this? Thanks.