Audio Technica AT 666 vacuum disc


Is anyone currently using it?
I have it on trial, the product is almost perfect NOS, but after about 7-8 minutes the LP loses its vacuum; is it necessary to also use a clamp to get the vacuum for the whole LP?
128x128best-groove
Dear @best-groove : Totally rigth in the Pioneer  issue, here the P3:

  http://www.thevintageknob.org/pioneer-Exclusive_P3.html


In the other side about something that you have to take with any vacuum LP hold down  is to mantain the platter clean to avoid that minuscle " dust " stay clamped for ever in the LP grooves at the same time that the LP side face-down to the platter be cleaned to protect it and to protect the rubber perimeter.

R.                                                                                                                                                                                                                                                                                                                                                                                                                                
raul, didn't you comment a few years ago that you found the AT-666 improved your SP-10 Mk2, even without using the vacuum feature?  Possibly better inertia from the (then) heavier platter?
Dear @pryso  : Nice to meet you again.

On your post it was not me. With out the vacuum you can play a LP because unstability/waves with the perimeter rubber and because you have to change the VTA/SRA .

R.