Where the evolution of guitar amplification in general traces musicians’ needs to be louder, the history of Vox follows, in particular, The Beatles’ need to play louder. As a result, the first AC50s were delivered to George Harrison and John Lennon as custom-made, single-channel heads and modified cabs ready just in time for the band’s Christmas ’64 concerts in Finsbury Park, London.
While the amp's output provided larger sound than the Vox AC30, the tube design called for two EL34 output tubes to achieve the additional power for bigger audiences. These EL34's also brought some tonal differences, mainly making the amp darker than its smaller counterparts, which levels out the Vox brightness and brings a bit more Marshall goodness!
Vox introduced Mark III of the AC50 at the end of 1965 and updated it with a solid state rectifier, giving it a tighter response and low end, with more volume, than its GZ34 rectified predecessor.
This 'large box' AC50 is an 1966 example in very good condition, with a replaced output transformer, a couple of replaced caps and two added output jacks. The faceplate is worn at the input area, but the head is overall still very clean with minimal wear.