Drop THX 789 Power Button Feel? - headphones

It should be plenty of power for a THX 789 I was just wondering what are the potential gains for switching to a linear power supply over the standard SMPS?

The Fluke 789 combines a Digital Multimeter and a Loop Calibrator in one rugged, handheld tool, putting a complete troubleshooting solution right in the palm

789pro 3-103-789 from Schurter at RS

789sexy Urmet Sch 7893 Power transformer 230V