Having faced this issue countless times, the only technique that consistently works is to fasten a 90 degree shelf bracket (which you can buy or fabricate yourself) to the top shelf at the back and to the wall. This will cure 95% of the problem.
Failing that, even wedging something between the wall and the back or the rack/shelf can help a bit, until it falls. :)
A vertically suspended turntable such as a Linn on the top shelf that is susceptible to footfalls is actually having to contend with some horizontal movement, which it cannot handle.
Failing that, even wedging something between the wall and the back or the rack/shelf can help a bit, until it falls. :)
A vertically suspended turntable such as a Linn on the top shelf that is susceptible to footfalls is actually having to contend with some horizontal movement, which it cannot handle.