sentences:  While it is based on the Blackface version, and utilizes a tube rectifier and a tube reverb, it uses printed circuit boards instead of eyelet-style hand-wired circuit boards.In Summer 2013, Fender released a redress of the Princeton Reverb reissue with slightly modified circuitry and the drip-edge "silverface" cosmetics introduced on Fender amplifiers in 1968.The model is known as the '68 Custom Princeton Reverb.