Psvane 845-HIFI or Shuguang 845B?

I believe the Psvanes are made by Shuguang perhaps with tighter tolerances and QC for the "higher" quality Psvane is supposed to represent. I can't tell you however, with certainty, that the 2 845s you mentioned are identical electrically.

So far, the 845-T has proven less reliable than the 845B in my experience with both. The 845-T sonically ranges from having no advantage over 845B to being slightly more resolved, depending on the amp. 845B has been incredibly reliable for me.

Two interesting newer alternatives: the Sophia 845mk3 carbon plate is considerably more expensive, and the cryogenically treated 845A that ATSI/Tubeman/Ken Chait sells is cheaper. This cryo 845A is much improved over the stock 845A, quite dynamic and the A tube's glare is tamed. I still prefer the B in my amps but the cryo A is an alternative with a vivid sound.

Phil

Phils experiences mirror mine. I had an 845-T fail in a very short period of time. I also greatly preferred the export grade 845B to the 845-T.