Last night I was rehearsing with my 66 BFDR and after about an hour i began to smell a strong burning smell. I immediately shut it down and unplugged it. I sniffed around and it seemed to be coming from the transformer side of the chassis. Could this be the transformer burning out? The only thing I've done lately to the amp was to install a NOS RCA 12AX7 tube in the V2 slot just last week. If this is the transformer does anyone have a suggestion for a replacement? Thanks appreciate the help.