CRT? Might depend on whether the tube has a frame or not, and if that frame has a spot for the chassis. Mine are just tubes with the metal band around and a loop on each corner. The wooden piece the tube sits on is a rectangle with a cutout also shaped like a rectangle but with the corners cut in like an octagon. The tube fits through, but the loops on the rim don't, so it hangs there. Screwed down, of course. The chassis is mounted to the cab wall, close by so the cables reach. This is for an Australian LAI lowboy cab, btw.