High End Quality Retailers in the Chicago, Il Area

I would not be increasing the amperage of a fuse. It was designed to blow at a predefined parameter or amperage. You would jeopardize your safety and the safety of the device. Fuses should have zero effect on what you hear. A fuse is a sacrificial device put in place to blow to prevent damage further upstream in the electrical circuit. 

Decibel Audio in Chicago.  Great helpful people and generous policies.  

Rogue Audio, Harbeth, KEF, Rega, etc.  

All good recommendations here, but I will chime in to say Abt in Glenview does carry some higher end gear as well: Levinson, McIntosh, Parasound, Auralic, Classe etc. they also have a pair of Martin Logan Neoliths on display - cool place in general.

+1 Music Direct ... outstanding customer service ...