At the beginning of the "tweed" era, Fender constructed many of its cabinets in "TV front" style, changing around 1950 predominantly to the"wide panel", where the top and bottom panel is wider than the side.
Fender later on constructed them with "narrow panel", in which all the panels have more or less the same width.
The construction of the amplifiers was changed as well: the chassis are mounted to the back with the tubes pointed down, as opposed to having the chassis mounted on the top of the cabinet.
This has the benefit of providing ease of access to the inside while providing a strong top.
Fender Amps repeatedly deliver genre defining sounds - Fender is arguably the most familiar name in the electric guitar world.
Amps such as the Fender Hot Rod Deluxe and Fender Blues Deluxe have been favourites of stars throughout music history, including Jonny Marr, Jack White and Bloc Party.
Fender stopped using the twill covering in 1960, though the Champ was still covered in twill until 1964.