Hey folks. i noticed today that when i dime the volume and treble the sound cuts out. I can leave it on 8.5 with no trouble and it sounds fabulous...but nudge it to 10 and it cuts out. its like it can't process anymore and just clips out. I ran the same test in 4 other various vintage fenders and they all held their own and wailed when dimed. This one however just does not like anything past 8.5 or 9 on the dial. That last little push ...and that,s it no sound. this one runs 6v6,s as you all know. The others i tested were all 6l6 models. Any ideas what this may be?