Dear Elegal: +++++ " Record clamps: do they really make a difference. " +++++
Always.
++++ " I cannot tell a difference. " +++++
but differences exist even that you can't detected yet.
There could be several reasons why you can't be aware of: maybe you can't do it because your system/room has no resolution for it, because a not so good analog rig overall set up, because even that your ears have the resolution you don't know what to look for, because you have no precise reference to compare it, etc, etc, etc.
In the other side, it's not matters if the LP is warped or not, you can hear a clamp for the better or worst.
Could be some reason why we can't detect a clamp " job "?, could be but I don't have the precise answer about.
Regards and enjoy the music,
R.