if the preamp has a phono section yes. if not, no.
The reason is that all the signals coming into a line stage are ALREADY at a high level, and the pre is really only attenuating them, and selecting the input. Thus some use only an attenuator as a pre, or no pre at all.
On the otherhand, a pre with a phono section actually IS amplifying the signal a lot from the tiny cart output.
The only other time a big power supply in a pre might help is when a big mismatch between the impedance matching of the source to pre, or pre to amp exists. (then the hefty power might cover the problem.
The reason is that all the signals coming into a line stage are ALREADY at a high level, and the pre is really only attenuating them, and selecting the input. Thus some use only an attenuator as a pre, or no pre at all.
On the otherhand, a pre with a phono section actually IS amplifying the signal a lot from the tiny cart output.
The only other time a big power supply in a pre might help is when a big mismatch between the impedance matching of the source to pre, or pre to amp exists. (then the hefty power might cover the problem.