1 Mitch Crane 2 years ago OK, so I pulled the trigger on a Gretsch Executive at a semi-local GC. They are shipping it to a GC closer to me. I'll have it next Tues. I'm not much of a tinkerer myself, but curious as to what you Exec owners may have done (if anything) to 'uprgrade' it from it's stock condition. It's coming with Groove Tubes, right ? Never been too keen on them, but if they do the job, fine... anyone do NOS tubes ? If so, what ? A JBL D130 is an obvious candidate, but will definately give the Legend 15 a fair shot. ... so what did you do (if anything) to 'dink' with a good thing ?