Brinkmann vs TW Acustic

Dgad, There are two other things that could account for the improvement to the already good isolation of the O rings on the SME. First, the table is sitting on a different surface now. I tried it briefly on the wood top shelf of my DIY rack. Not it is on 286 lbs of steel and so the energy is draining down into a larger mass. Second, the motor controller is now isolated on the steel and Vibraplane from floor born vibrations.. Both contribute to the improvement.

"This is a cardinal sin of bad belt-drive turntable design. (The commercial product analog is to use a suspended chassis bearing the platter and tonearm whilst the motor drive is fixed to the inert plinth.) This results in some of the most obvious "wow" that I've ever heard in vinyl reproduction. The original AR turntable was guilty of that infraction, as were the early SOTA turntables. Especially, to put the turntable on a Vibraplane or similar device and the motor on an inert shelf system is asking for trouble."

Good point Lew...
My previous T/T (an LP12) was prone to a phenomenon some referred to as "breathing". (Note this could also be related to platter balance issues)
If you positioned your eyes level with the platter and checked the top plate clearance you could see the platter edge/clearance oscillate due to the pull of the belt.

The turntable sounded very musical despite this effect :)
Kind regards.....

Ct0157
FWIW my TW AC with BN PSU and 3 motor unit takes 8 seconds for the platter to come to a complete halt after pressing the stop button and with the tone arm at rest

Cto157
My Raven AC with 3 motors. Two at the side and one at the back takes 6.7 seconds to stop based on 4 samples.

Cheers

Moonglum (and Thuchan), I kind of regretted the acerbity of that post. What Thuchan proposed is not nearly as "sinful" as were the designs of the AR turntable and the early SOTAs (and maybe also the LP12; I wouldn't know). His set-up is not going to allow nearly as much relative motion between the motor pulley and the platter as did the two I cited. Further, I am sure he uses string or some other relatively non-elastic belt; the AR and the SOTA used elastic belts, making the problem worse.

I used to hang out at a dealership where the proprietor was fond of the Verdier. He used to mount the turntable and the motor about 4-5 feet apart, as was the custom. This meant that the two had to be on separate supports, using string drive. The shortcoming of that set-up for the Verdier would be that the table itself is mounted on "spongy" feet; as I recall it actually can rock a little if you push on the chassis. That would concern me, since the motor is immobile.