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The Brownface series was introduced in 1959 and discontinued in 1963.
This period marked the beginning of Fender's use of Tolex to cover amp cabinets.
The Brown amplifiers included all of the all-in-one combo amps except the flagship Twin and Vibrasonic, and the little Champ which retained its "tweed" (twill) covering.
The Blonde amplifiers included all of the piggyback Fender amps (the Tremolux, Bassman, Showman, and Bandmaster) as well as the Twin and Vibrasonic combos.
The Dual Pro was the first twin speaker amp and also the first amp to employ a finger-jointed pine cabinet and the first amp with a top facing control panel.
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 mostly stopped using the twill covering in 1960, though the Harvard was still covered in twill until 1963, and the Champ until 1964.
The first of these amps were the K&F models, which were produced between 19.
Fender began using silicon rectifiers to reduce heat and voltage sag caused by tube rectifiers, and introduced an all-new, very complex vibrato circuit.