FENDER 1959 Bassman "Tweed"

http://www.300guitars.com/2009/09/28/fender-5f6-a-4x10-bassman-the-perfect-amp-for-guitar/

Vintage 1959 fender bassman chassis 90-95% original. New filter caps. 3 prong cord installed. Original transformers and choke. Jensen p10r F alnico speakers. Laquered tweed lightweight custom pine cab by MOJO Tone. Refurbished chassis by glen morris amplication in ontario canada. Amp weighs just under 60 lbs.

Narrow panel models, 1954 to 1960[edit]

Fender began making other models with tweed covering, a similar open backed cabinet with a rectangular grill cloth and a narrow (just over an inch wide) tweed covered panel at the top and bottom. Produced from 1954 until 1960, these models are called the "narrow panel" tweed amps

Fender introduced the model 5D6 "DK" in November 1954 followed by the 5E6 Bassman Amp during early 1955. The 5E6-A Bassman model was introduced later that year and included some evolutionary improvements.[citation needed] Demand for the tweed Bassman amp grew, so Fender increased production. By the middle of 1957 more than 1,500 examples of the 5E6 series had been sold.[6]

In July 1957, Fender introduced the model 5F6 Bassman. This model also had four Jensen P10R speakers, but the power supply was redesigned around a single 83 mercury vapor rectifier tube, and a new preamp circuit was introduced that included a three knob tone stack, with separate controls for Treble, Mid and Bass. The power amp included a "long tailed pair" phase inverter, an innovation that noticeably increased the "headroom" or clean power output capability of the amplifier. Similar preamp changes were also incorporated in the 5F8 Twin Amp at about the same time, but not on other large size Fender amps.

During 1958, Fender introduced the model 5F6-A Bassman model. This final 1950s Tweed Bassman model product line included a change from the 5Y3 to the GZ34 rectifier tube, as well as a modification within the Presence control circuit.[7] During early 1960, Fender began producing the 5F6-A Bassman with Jensen P10Q speakers. The P10Q Jensen speakers are more able to manage stronger electrical input power and generate better "clean" output sounds than previous installed P10R Jensen speakers. The P10R Jensen speakers were shipped within all Fender Bassmen from late 1954 until early 1960. Many professional music industry analysts have heralded the 1950s Fender 4×10 Bassman amps as the greatest guitar amp ever. The first 1954 Fender Tweed 5D6 4×10 circuit generated further Tweed Bassman amplifier development through 1960. Several Bassman models were progressively influenced by the 5D6 through the last Fender Tweed 5F6-A Bassman's circuit design. The 5F6-A Bassman's design was directly copied by Marshall Amplifiers within their JTM-45 amplifier during the early 1960s