Fender entered a new phase of amplifier construction dubbed 'the tweed phase'. This phase saw the company drape their amplifiers in a cloth covering, which consists of varnished cotton twill. This is incorrectly called tweed because of its feel and appearance (actual tweed is a rough woolen fabric). The amps made during this period were a considerable leap forward for Fender, and they are often praised for their sound and their circuitry. Fender generally stopped using the twill covering in 1960, though the Harvard was still covered in twill until 1963, and the Champ until 1964. At the beginning of the "tweed" era, Fender constructed many of its cabinets in "TV front" style, amps which bore a strong resemblance to TVs of the time. In 1955 they shifted to the "wide panel" design, a more conventional design where the top and bottom panels are wider than the side. Fender later constructed them with "narrow panel", in which all the panels have more or less the same width. Brownface (Brown and Blonde) The Brownface series was introduced in 1959. The name 'brownface' stems from the brown-colored control panels, common to both the brown- and cream/blonde- Tolex-covered amps. The brownface amps originally featured a dark maroon or "oxblood" grillcloth, which was changed to "wheat" in 1962-63. The shift from tweed to Tolex occurred in limited production in 1960. The tolex on the earliest versions in this era was pinkish brown and rough textured. There were only six amplifiers covered in tolex originally, the Professional Series: Bandmaster, Concert, Pro, Super, Twin (production halted Feb-May 1960, resumed as the blonde Twin) and Vibrasonic. The cheaper student models (Champ, Harvard, Princeton) remained tweed-covered until later in the decade. The 1x10" Harvard was discontinued in 1961(though in 1962-63 Fender built a small number of "Harvards" which were actually assembled from leftover tweed-Princeton parts given Harvard nameplates). The 1x8" Champ remained tweed-covered until 1963 when it made the change to black tolex, and the Princeton acquired its brown tolex in 1962 along with a complete redesign that saw it adopt more powerful twin-6v6 circuit and a larger speaker: 1x10". The first tolex cover used by Fender was a light brown one matched with dark maroon or "oxblood" grillcloth. This look didn't last long and by 1961 Fender was using a darker brown tolex which remained commonplace until 1963. There were three different grillcloth colors used during this