Uber, Difference between TT71 and TT81 is probably an audible shade. Difference between TT81 and TT101 is probably a more audible shade. You might ask Halcro, who has had a TT81 side by side in his home system with a TT101. But I doubt there is much if any difference in cost on today's market between TT71 and TT81, so why not go for the latter, if you must have a Victor and cannot afford a TT101 (or don't want to deal with its possible problems)? Best-groove seems to be recommending the TT81, too. For me, the DP80 would be the choice over any Victor except the TT101. And TT101 vs DP80 would be a toss-up. I own both and use both. (TT801 is simply a TT101 with vacuum hold down. If you think the TT101 is mechanically and electrically problematic, think about that 40-year old vacuum platter of the TT801, complete with decayed rubber gaskets and its associated outboard pump.)