[quote name='jonsmith' timestamp='1452437470' post='2949902']
I'm pretty sure it's JT, even if it gets scrappy towards the end. Most of these isolated bass parts reveal scrappy or out of time playing - even the ones from the likes of Geddy Lee. That's part of where the energy in performance comes from in my opinion (as opposed to the trend amongst some to quantise everything until it loses all sense of feeling). When deciding to go with a take, you'd listen in context with the other instruments (drums especially) rather than how the bassline sat on its own. The fact that so many untidy performances both in sound and execution have ended up on very successful recordings demonstrates that the part doesn't have to be perfect, it just has to fit in a pleasing way.
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^This - There's always loads of debate on youtube comments for these isolated bass tracks. Quote 'Thats not Steve Harris / Geddy / etc etc, he would never be that sloppy' - People always forget that they're listening to the bass track in isolation, and that would never happen during the recording process..