It also featured a solid state rectifier common practice nowadays in place of the old GZ34 tube. We recently wrote an article detailing that rich history which you can read herebut for those simply looking to figure out how old their Marshall amp is, we offer this shortcut. AFD was recorded with this amp. Terry Marshall has also said that he was present at the first trial marshall amps vintage Dating the prototype amp, that he was playing sax in the Ealing Club band, and that he also remembers the guitars that were used that day… a Strat and a Gibson While Fender and Vox amps have their place in moving electrified guitar forward, the creations of Jim Marshall fostered an entirely new sound and allowed guitarists to fill stadiums with it. Only the 50w suffered from the lack of gain at low volumes. It was basically a copy marshall amps vintage Dating the Fender Bassman. They are as reliable as the PTP Marshalls.