Your preamp should be the only grounded component to achieve the lowest noise floor. The other components drain to ground through the interconnects, to the preamp, and then through the preamp's grounded power cord.
Danger will then be present if you either
A.) Unplug the preamp from the wall, or
B.) Remove the interconnects between a (ungrounded) component and the (grounded) preamp, or
c.) Both
If you use a cheater plug(s) on a component(s) to eliminate hum (ground loops) just make sure the component has a path to ground -- usually through the ICs and the preamp. If you need to rearrange your stuff, just turn it all off AND unplug it first (which you should do anyway!)
.
Danger will then be present if you either
A.) Unplug the preamp from the wall, or
B.) Remove the interconnects between a (ungrounded) component and the (grounded) preamp, or
c.) Both
If you use a cheater plug(s) on a component(s) to eliminate hum (ground loops) just make sure the component has a path to ground -- usually through the ICs and the preamp. If you need to rearrange your stuff, just turn it all off AND unplug it first (which you should do anyway!)
.