[Ron Ramirez]

The 38-690 tuner sits on a solid wood shelf so there is no real reason for it to have a metal cover. It's been a while since I owned a 37-690 but looking at photos of the set Ken purchased, it looks like the tuner is supported by two thin pieces of wood, front and back, with the center portion of the tuner's underbelly exposed. This would therefore make sense that it would likely have had a cover originally. It was probably lost over the decades by some sloppy repairman.