I play a 1970ish Original Shin-ei Uni-Vibe with an Original 1960 Gibson Les Paul Standard through a 1968 Marshall 50W Lead Plexi half stack. Simon Karlsson plays a 1963 Fender Stratocaster. Both the pre amp and the modulation is just amazing. This effect was used on the Pink Floyd song Breathe and on Hendrix Band of Gypsies album.