Thanks Freeztar, I should've known it'd be you

Even though the original from Electric Ladyland is extremely hard to beat, the one you posted is new to me and pretty cool, sort of halfway between the polished finished piece and the called "rare" that hasn't been rare in 10 years that has him playing into a cassette deck by himself to "show the song to the guys". If you have it loud enough you can hear him rustle the paper he wrote it on, as well as Jimi whistling the effects he imagined right from jump street. I looked for the original, which is possibly his Opus Magnus but it seems DRM greed, maybe his half-sister Janie, have pulled down all the Ladyland stuff from YouTube. Grrrr! So while it's still up there here's two gems
Awesome dreamy Villanova Junction
Heaviest Improv the one that baffled Miles Davis
Get a downloader as they probably will be gone soon