Leo Fender began building guitar amps before he started manufacturing guitars.

The first of these amps were the K&F models, which were produced between 19.

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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.

Fender later on constructed them with "narrow panel", in which all the panels have more or less the same width.

Toward the end, despite keeping such construction, Fender utilized tolex to cover its amps.

The first kind used was an off-white fabric, followed by a horizontal-stripe two-tone pattern, and finally a two-tone twill.

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.

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.

The original Fender amps were tube-powered and the company also started producing solid-state models in the late 1960s.