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Lew
I know that it is a leap but, we have experienced problems with servo feedback systems in our, hydraulic industry.
This where shielding has been inadequate. ( yes I thought of Halcro's birthday suit) while simultaneously being exposed to RFI.
A famous one was where the Cats hydraulic lifted stage in London would move all by itself. Problem was traced to poor shielding letting in transmissions from the ubiquitous London cabs outside.

When the obvious causes are exhausted we need to explore the path less travelled.

Good luck

No problems with Halcro's "birthday suit" Victor.......:-)
Running both TT-81 & TT-101 without the metal casing is preferable to these ears........

Halcro
I have no doubt that they are better au-naturel.
It makes sense to eliminate this material from around the motor. Imagine the fields set up in it due to the power supply and the rotating magnets.
Fields acting on sensitive analogue circuits.
It would likely be better still to move the PCB's away from the motor.
I remember you talking about this?

Removing the shield though does open the very remote potential to outside RFI issues. But I suspect, as earlier, a very big leap.

Halcro, Did you not report earlier some issues related to removal of the outer cage? Either this had a bad effect on the tt itself or on some nearby components. And Richard, since we had concluded rightly or wrongly that the outer cage is an RF shield, why would you have no doubt that the TT's work better without them? I would say it's a toss-up, without knowing the real why of the cage, other than to provide physical protection for the working bits inside. The motor is a well enclosed unique and separate structure, by the way. Possibly its radiation is shielded from the circuitry thusly, even without the cage in place.

I will receive my TT101 tomorrow. If it malfunctions, I will try removing the cage. If that does not work, I will kick it.

Lew.

Good points raised. Perhaps I should have said "little doubt" Experience has shown that doing away with shielding, provided their is no problematic external RFI, is "almost always" better.

Don't kick it too hard.