BIX TT Won't Hold Speed - Bearing Lube?

I have to admit upfront that I'm ignorant as to what type of bearing the BIX uses. What you describe kind of sounds like temp related issues, but I have a hard time believing that a few degrees difference inside your house between winter and summer could be causing this, at least as it might relate to lubrication. Very strange, indeed.

One experiment you could try is to get a can of freeze spray (Rat Shack maybe?) and some kind of digital temp sensor. Then you have a direct method for cooling down the bearing while watching the temp at the oil bath. Measure the speed with a strobe while the temp is low, then again at a normal room temp in the summer.

Yes, it's kind of a strange problem. Perhaps the bearing is still breaking in... Anyway, it seems to be set for summer temperatures. But if I have to keep fiddling with the electronic speed control I'll try experimenting with a different type of synthetic oil - maybe multi-viscosity 5W30 weight. There was an Australian company advertising some type of super-duper turntable bearing lube a while back, and it was reasonably priced. I just can't remember the name of the company (or product, for that matter). Has anyone tried that one?

Another thing I may experiment with is the drive belt. Right now I'm using a monofilament belt that came with the turntable but I've heard that some folks have had very good results using tape belts. I'm thinking that perhaps more contact area may help, but I could be wrong. I don't know that the belt is slipping; it may actually be turning slower because of the higher perceived load.

Why don;t you try watchmakers' lube. It doesn;t leave residue. If lube's the culprit (sounds like it)