Fender Princeton Reverb Phaser It doesn’t just look cool:

It doesn’t just look cool: serviced and fitted with new custom tape loops

Rocker switches below the keys control various filters/tremolo depth etc: some are more effective than others

" - Read more on the Eve Audio site

The final Youtube demo really nails the rock guitar sound (with thanks to the uploader):

Fender Princeton Reverb Phaser It doesn’t just look cool:1980 USA Silverface Fender Princeton Reverb valve amp in excellent cosmetic condition and superb working order. It's just been serviced and modded to Blackface circuit spec (when the pull boost is not engaged). Everything looks to be original internally aside from minor components you'd expect to be changed in regular servicing. I love Princeton Reverbs great sounding amps with a sweet tone and a great tremolo and this one doesnt disappoint: nails