The GML 8355 is the power supply for models 8200, 8302, 8304 and 9500. When power supplies are built into the same chassis as the audio circuitry, power transformers can radiate nasty magnetic fields into nearby audio paths increasing noise while additional heat generation brought on by transformers, rectifiers, and regulators can contribute to unwanted drift of operational parameters and premature failure of componentry. To avoid these problems, all GML outboard processors use stringently regulated and pure filtered external power supplies. All GML power supplies come  a country-specific detachable IEC mains power cord. Both the 8355 and the 9015 are internally switchable between 110v and 220v mains voltages making them flexible for engineers traveling overseas. Notably, these GML Power Supplies have an exceptionally wide input voltage tolerance (±30percent) for reliable operation under questionable power conditions.