Analog_source, problem with most of amplifiers is that its linear power supply is unregulated and it is AC only. Switching power supplies on the other hand are load and line regulated and often work on DC voltage. Some are better some are worse. Computer switchers are horrible but Icepower built in are very decent. Rowland uses new 1MHz switcher in Model 625 (class AB) amplifier. This power supply is extremely quiet with zero current, zero voltage switching. Many people believe that power supply has to have huge transformer and a lot of electrolytic caps while transformer of the same power at 100kHz is 10x smaller. Also electrolytic caps are smaller because frequency is much higher (filtration). Finding amp with regulated power supply would perhaps be the better solution than using external regulators or batteries and inverters. Switching power supply, like one in my Rowland 102 (Icepower) works also on DC making it immune to presence of DC on AC line (subject of headache for many).
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