Rob wrote:
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Phil Allison

Any comments?


It may seem like this PSU is fancy, but in a really modern PSU there is
no 120/240 switch and the PSU automatically works between 80 and 250V AC.


** Yep - most of those kind of SMPSs are know as "PFC corrected" .

The incoming AC is rectified and converted to 400V DC by a switching converter that tracks the incoming AC voltage. Makes the current wave follow the voltage wave ( both sine) so the "power factor" is close to unity.

Has advantages in terms of how many units can be run of the same power circuit and is often mandated in regulations for lighting and computer products.

But not for domestic or entertainment audio.


...... Phil