It's not BAD, but it's far from good. We've seen worse.
It will be visible in the projected image, unless you set it up so the raster stays in the worn area.
But that's the worst part of that tube... it was originally setup WAAAY too small.. only using half of the original phosphor area. If the original setup had been done correctly, more phosphor would've been available, yielding a brighter image, meaning that the contrast wouldn't have to be cranked, and that wear wouldn't be a problem after only 1900 hours.
My valuation for a 9PG with tubes like that would be ~$1000.
If you get it, it might be a good candidate to intentionally wear the unworn area to even out the phosphor... that way you can expand the raster out to the edges.
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