Interesting that people keep banging on about "kettle leads" in this thread as it is unlikely that any piece of hi-fi equipment has ever been supplied with a kettle lead.
The leads supplied with general electronic and hi-fi equipment use IEC 60320 type C13 socket on the end of the lead and C14 plugs on the equipment, whereas a kettle lead uses a type C15 socket on the lead and a C16 plug on the kettle.
The C15/16 type are temperature rated to 120 degC whereas the C13/14 types are only rated at 70degC, hence why the former are used on kettles. Furthermore, the C15/16 types have a notch in their locating flange which means that, whilst a C15 lead will fit into a C14 connector, a C13 lead will not fit into a C16 connector thus making sure you can't use a 70 degC rated lead on a kettle. Therefore, what people are referring to as a "kettle lead" in hi-fi terms won't actually fit into a kettle!
Also, it's worth considering that a bog standard mains lead generally has 1mm square cores. These are rated at 10A at 250V and thus will allow 2500W of power down them without getting upset. Consequently, I struggle to see how they can be considered as being a "bottleneck" to a piece of hi-fi equipment that is rated at much less than that - even the beefy studio power amp I bought last week to have a play with is only rated at 700W!
As you were...
Engineers: fixing problems you didn't know you had in ways you don't understand.