Thanks for the come backs, some valuable information here!
Should have said this in the original post, the ss34 is the rectifier from a step up module, I let the output leads short together, OOOPs.
I'm still looking for 2 things, the PB13 specs, it came off of a server power supply board, right next to an inductor, so I figure it's part of a smps setup, but I haven't found the specs, it's forward voltage drop indicates schottkey.
The other thing I'm still looking for is the other replacement I found that grew wings and flew away, it had a forward voltage drop of .089v if I remember and read my meter correctly, even if that does seem low.
The PB13 is in the circuit and feeding a COB LED, voltage = 35, current = 600ma, seems like it's working.
Thanks, again,
Jeff