Victor TT 101 vs TT 81


I am aware of some of the differences regarding the motors of these two units, but I was wondering if anyone had insights as to the differences in sound (if any) and the differences in reliability (I'm guessing the 81 being simpler might be more reliable, however, it seems to have the better motor).  Any info will be appreciated.
rgs
Henry, et al.  I thought you told us long ago that the motor of the TT81, while it may or may not be absolutely identical to that of the TT101, is also coreless.  (I made a claim that it was not, which prompted you or someone else to post a brochure on the TT81 that seemed indeed to say it had a coreless motor.) In your initial post on this thread, I am unsure what you are saying vis a vis the TT81, coreless or not coreless?  I do tend to like coreless motors, too, based on the performance of my L07D, as compared to my other DD turntables using multi-pole motors. Heretofore, I thought the major difference between the two is that the TT101 has a bi-directional servo, can correct speed if either too fast or too slow, whereas the TT81 servo is only reading "too slow".

A question, if not a plea, to HWS:  Have you got "a guy" who can work on my TT101?  I'd love to get it up and running, and I have a pretty good idea where the problem lies, just not the knowledge to identify it specifically and fix it.  So far as I know, it does not need a new master chip, but I do have a few spares of those, if that were to be the case.  Like Halcro says, I gave a spare chip to another frustrated TT101 owner in Germany, still waiting for his results.
VintageKnob is often an unreliable source.
You can download the Service Manuals for both TT-81 and TT-101 units from Vinyl Engine
http://www.vinylengine.com/library/jvc/tt-81.shtml
http://www.vinylengine.com/library/jvc/tt-101.shtml
which disclose that the 101 is coreless but not the 81.
They BOTH however, share the bi-directional servo control (a Victor patent) which IMHO is one of the secrets to their exceptional performance.

I am blown away by the amount of interest in these Victor motors.  When they were selling them everyone wanted the Technics, or the Kenwood, or the Micro three arm, etc.  One hearing and I knew these were special but stopped using it decades ago probably due to the really bad base and arm arrangement.

I have never had to fix mine but I will tell you it does act up if you don't use it.  When I took it out to mount in the new base it took almost all day for it to figure out how to run right and that was with me coaxing it along!!  I've mechanically worked on it, changed the thrust disc, lubed and polished the shaft, etc. but have not had to do anything electrical to it yet.

Someone mentioned Bill Thallman and while I don't know if he has ever worked on a TT-101 he is an electronics wiz-bang and I would trust him with mine.  I have guys at the factory and I know a few engineers with the patience for this work but they are not experts on this item.

HW

What is wrong with your TT-101?  Is it electrical or mechanical?  Remember, this is a low power system and any mechanical issue will result in that motor spending the whole day trying to correct itself.

HW