You should be very careful when using "cheater" plugs or removing the ground prong on a plug.
Equipment ground is there for your safety, removing it eliminates electricity having a safe path to ground.
Solving the source of your problem - a difference in potential with the different grounds in your system - is the best way to solve the problem.
Try using a single circuit. If that's not practical, try using a single circuit for your amplifiers and another single circuit for your source components.
If this doesn't work, you'll need to identify the source of the hum. Unplug a single component, one at a time, to see if it removes the hum - trying the preamp last.
Once you find the source(s), try plugging them into a circuit common with other parts of the system. Say a transport is the problem and it's plugged in a separate circuit, try plugging it in with the rest of your source components, or your amplifier(s) - in that order.
If all your equipment is plugged into a common circuit, than your equipment is suspect and it is NOT recommended to remove the ground prong of the plug.
Good luck and hope this helps.
Equipment ground is there for your safety, removing it eliminates electricity having a safe path to ground.
Solving the source of your problem - a difference in potential with the different grounds in your system - is the best way to solve the problem.
Try using a single circuit. If that's not practical, try using a single circuit for your amplifiers and another single circuit for your source components.
If this doesn't work, you'll need to identify the source of the hum. Unplug a single component, one at a time, to see if it removes the hum - trying the preamp last.
Once you find the source(s), try plugging them into a circuit common with other parts of the system. Say a transport is the problem and it's plugged in a separate circuit, try plugging it in with the rest of your source components, or your amplifier(s) - in that order.
If all your equipment is plugged into a common circuit, than your equipment is suspect and it is NOT recommended to remove the ground prong of the plug.
Good luck and hope this helps.