Fender silverface twin reverb dating
Other changes include the shift of the top-of-the-line model from the traditional Twin to include other models, like the Vibrasonic in early 1960, as well as the blonde Showman in 1961.
Fender began using silicon rectifiers to reduce heat and voltage sag caused by tube rectifiers, and introduced an all-new, very complex vibrato circuit. The circuit was also changed to include a tremolo effect, and the output was increased.
These early models are referred to as "TV-Fronts" due to the shape of the cabinet when viewed from above.
The Dual Pro was the first twin-speaker amplifier, and also the first to employ a finger-jointed pine cabinet and the amp with a top-facing control panel.
They were made in three sizes, 1×8" (one 8-inch speaker), 1×10", and 1×15".
They are all very rare today and few have survived.
The first cloth used was an off-white fabric, followed by a horizontal-stripe two-tone pattern, and finally a two-tone twill.
This period marked the beginning of Fender's use of Tolex to cover amp cabinets.
By mid-1961, after this short-lived look, Fender was using the darker brown tolex which was a mainstay for many of the mid-1961 to 1963 amps.
Between 19, there were three different grillcloth colors: wheat, brown, and maroon and many tolex-grille color combinations are found suggesting that Fender was not reluctant to use up whatever stocks of materials were on hand.
While the majority of the piggybacks were produced in blonde tolex, there are a few examples of the brown tolex Bassman amplifiers.
Accomplishments for the company's amplifier division during these years include the introduction of the stand-alone spring reverb unit in 1961, followed by incorporation of the reverb circuit within a combo-amp design with the 1963 Vibroverb.