Hi Martin,

Disregarding your Power Plant, which will be quieter than direct mains connection, you have doubled the supply line rejection of mains born interference and rectification artefacts of your composite Technics power supply, which would drop the background noise level being fed to the control and motor drive circuitry. This would clean up the low-level information presentation.

The rest of the regulator mods take this a little further although the law of diminishing returns will apply to a degree with this noise reduction, as other circuit noise sources will start to dominate. The additional individual stage regulators will show a more pronounced effect on the reduction of power supply inter-modulation around the circuit power supply distribution on the motor board between the various control circuit stages and the motor drive section. This inter-modulation clutter can be considered as a noise source. Reducing this will also clean up the presentation in quite interesting ways.

Regards
Paul