IMO, you should sell them together. People want things to just plug 'n play. Separating them may squeeze out a few extra dollars but you may be stuck with one longer than you will be if you sell as a package.
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"People want things to just plug 'n play" That may be true of the general population but I have found that Audiogon members want to assemble their own systems and that things are usually worth more individually than as a group. IMHO the table is better than the arm and if I wanted to keep it for my own use I would put a newer SME or Graham SME mount arm on it; YMMV.
Elliott, if you are willing to sell it for $500-600 I'll buy it. The SP-10 by itself should be worth $600-800. Technics had three different plinths for that motor unit so if the Obsidian is not chipped or cracked it could be worth another $300, possibly more, they are rarely sold by themselves.
Listen to Stanwal regarding the SME, I'm not familiar with its value range.
BTW, how did you adjust the speed pots? This is a Quartz-loc unit.
Tim, Hypothetically, he could have adjusted the voltage out of the outboard power supply. There are 3 DC voltages supplied to the main chassis via the umbilical, and each can be adjusted separately, as you probably know. However, the OP has not clearly stated that he has a Mk II. He might have an all-on-one-chassis, original SP10. If so, his idea of value is not far wrong.