The instructions say you can sub the J112 with a 2N5457.
Can I use a 2N5485?
AFAIK yes. I would socket it just the same. But the pinouts are identical. It's been quite a while so I don't remember exactly why I spec'd J112, but if I indicated 2n5457 as a sub, then I tried it so that leads me to believe a 5485 would work.
I know I could have just do the research and tested it out myself like I should. But I'm feeling lasy tonight. :(
Thanks