Tom-
Larry is correct. (And Norm is on the right track, too.

) It does sound in E flat, but Chet is in dropped D tuning (D-A-D-G-B-E, 6th-1st), tuned up a half step. Chet tuned his first Delvecchio (pictured on the first duet LP with
Hank Snow, and on the cover of
My Favorite Guitars) up a half step quite a bit for some reason. All of side 2 of
More of That Guitar Country is tuned up a half step.
Paul and I discussed this, and came up with several possibilities:
1. Chet liked the higher tension from tuning up a half step. (Chet's first two DV's had the short scale, with lower tension.)
2. The higher tuning "fixed" some sort of problem that the DV had. (Possibly a buzz or rattle.)
3. He just liked the way it sounded.
I didn't ask Chet, although we had a conversation about the DV once, and by the time Paul started working with him he was using the second DV (the one with the V cutouts).
Craig