External Power Supply For My Audiolab 6000CDT CD Transport

I wouldn't pay too much attention to architecture of power supply.  There are extremely quiet resonant mode SMPS that switch at zero voltage / zero current, while Linear Power Supplies are in reality primitive switchers that operate at 120Hz producing a lot of high frequency noise (switching at max voltage) and the only "Linear" part of it is that they are line and load unregulated (at least in power amps).  Benchmark reduced noise by 10dB by switching from linear power supply in DAC1 to SMPS in DAC2 and DAC3.  SMPS got Really bad rap from noisy computer applications, but can be wonderful if done right.  My Benchmark AHB2 has SMPS and is very quiet.   All current Rowland products contain SMPS (even preamps). Why then well designed SMPS are not that popular?  Perhaps because of demand - people believe it has to be heavy to deliver a lot of power while "switching" has to be noisy.  After all class D is controlled SMPS.  If it is quiet enough for an amp it should be good enough just for power supply.

@audphile1   I believe there are fantastic power supplies in either technology, but SMPS are way more complex to design (and perhaps harder to repair).  Rowland's SMPS operate at extremely high switching frequency (incredible 1MHz) that is much easier to filter out than 120Hz in linear supplies.  Small ferrite couple of inch transformer operating at high frequency can deliver as much power as 50 lbs iron transformer operating at 60Hz.   

@invalid Let me offer this - all power supplies are SMPS (they switch and the power is delivered in narrow current spikes with width dependent on the load). Some operate at 120Hz others at 100kHz and the best (like Rowland) at 1MHz. In linear supplies rectifier diodes get reverse polarized at the peak of 120Hz wave. For a moment they conduct in opposite direction creating big current spike. Faster diodes like Schottkys won’t help much since fast recovery (dv/dt) is even more dangerous. Narrow spike (fast snap back) contains pretty much all frequencies and will couple to any, even smallest inductance (like piece of trace). Some rectifiers like HEXFREDS offer slower snap back (softness of the diode). I don’t want to bother you with technical nonsense - just want to say that things are not as simple as they appear to be. Ears are the best guide.