When did yamaha update their faders on the ls9 and how can I tell if they are updated or old stock?
around 2009 I believe. You can normal easily spot the different. Older ones don't have shiny black dust covers. New ones have black dust covers. Even newer generations might have something different, but I used to use a 1st Gen LS9 and then we had a 2nd Gen with dust covers.
We slowly had to update the original 1st Gen as faders died. Should have had done the whole desk, but at the time for first replacement, it wasn't common knowledge about faders.