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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.
Fender amplifiers became established with the tweed series, wood cases covered in varnished cotton twill in the manner of suitcases of the era.
This period marked the beginning of Fender's use of Tolex to cover amp cabinets.
The first amplifiers made in-house by the Fender Electric Instrument Company have been dubbed the Woodie series, built in 1946 through 1948.
They included the Model 26 Deluxe, the Princeton, and the Professional.
The construction of the chassis was changed as well, 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.
While the majority of the piggybacks were produced in blonde tolex, there are a few examples of the brown tolex Bassman amplifiers.