This was my experience as well. Bought a bunch of NOS and after the first ten matched each other I stopped testing.

The part that is obsolete is Q102,202 Toshiba-2SA1312BLTE85LF, the suggested remplacement part is: 2SA1163-BLLF and it seems to work fine in the coaster.

Well you can get the Bill of Material from the Schiit website along with the schematic. Assuming you have a history of soldering through hole devices, but no smb experience, you could, for very few dollars, buy a smb solder practice board off Amazon. With less than an hour practice you should be...

Here is my coaster build, for the smb parts I used solder paste and a toaster oven. Sounds great. Thanks to Jason for the pcb. The pads are huge making placing parts much easier and the space between the pads helps avoid solder bridges.