We build all of our products to high standards, including taking care to include good quality power supplies when required. However, replacing a switching power supply with a linear power supply can make a marked and appreciable improvement in sound quality. In fact, so many customers came to us with this question that we felt compelled to design and make our own linear power supply, please see our PS-1.
Should you choose to go with a third party PSU, keep in mind the following specs as guidelines:
Note the barrel connector we use is 5.5mm OD x 2.1 mm ID and (+) is on the inside of the connector.