Musical Fidelity A5 Phono Stage

Need some advice. My rig is:

Pro-ject Debut Carbon with 2M Blue, Herbie Mat, isolation table, feet, etc. speed controller.
Musical Fidelity Integrated A5 amp
B&W 804N speakers

the analog rig is performing pretty well. Some albums are epic, some are just ok. par for the vinyl course i suppose.

I'm trying to get everything to full potential and i'm concerned with the integrated phono stage. it has a bit of 60 cycle hum when the volume is turned up past about 10 o'clock; much higher to achieve similar volume on other inputs. (yes, even with the turntable off).

I'm considering an upgrade. probably SS. my concern with tubes is maybe a loss in clarity. i love tubes but not sure this is the best place to put them with such a delicate signal.

I see a turntable upgrade in the next 12 months so i dont mind the phono stage outperforming the table at this point. would probably be on a $500 budget, but would be open to a used stage.

any suggestions?

Cheers