Sorry to hear about the power supply, I had something similar happen with a 
Yamaha Surround-Sound system I recently bought, the microphone for the auto 
calibration feature was missing, a call to my local electrical store where I 
bought the product set in chain the motion of events which lead to me receiving 
a replacement microphone in the mail so perhaps you could contact the Amazon 
seller concerned and tell them what's happened.

I have the model of yamaha desktop Hi-Fi below the one you have, that is the 
TSX-130 and it has a built-in power supply, that is to say it has a power cord 
protruding from the rear left side.

I can understand why Yamaha chose to use an external supply, firstly given the 
size of the unit, obviously if the unit doesn't have the supply built-in then 
Yamaha can put more electronics into the same size.

seems lots of company's are opting for this approach, my HP 8500a+ printer has 
an external supply and its enormous! even bigger than the HP power supply that 
handles my HP Multi Media PC Notebook and that's getting to house-brick size.



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