Hendrix had 4 different Marshall setups live over the years. The purple stack, to my recollection, never went on tour with him. He just used the old hand-wired Lead heads with the channels jumped and 1960 straight/slant cabs. There was very little variation in that.
The store owner was right, though. Jim Marshall custom covered one in purple for him.
_________________________
I love science, and it pains me to think that so many are terrified of the subject or feel that choosing it means you cannot also choose compassion, or the arts, or be awed by nature. Science is not meant to cure us of mystery, but to reinvent and reinvigorate it. -R. Sapolsky
Upton Bass Custom 3/4 Upright, BSX Custom Allegro EUB, '80s Peavey T-40, MIM Active Jazz Bass, Godin BG-5 (for sale!), Fender Bassman 100 , `68 Fender Bassman 50 head, SWR Goliath 4x10, Markbass 2x10 cab