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?
best-groove
Lol ... you wrote a heresy; speed has nothing to do with it, it’s always a 12 "instead of 7"

it is important to communicate with whoever owns this item.