Sugarbrie, I have done essentially what you describe. My phono, preamp, speakers and amplifiers do contain the same wire I choose for speaker cable and interconnect. There are hundreds of feet of wire in every stereo system that remains unaccessible to the end user. Examples are chokes, transformers, wire wound resistors, discrete volume controls, coils, printed circuit boards and other wire based products. Once the input and output wires have been replaced, and the wire in the speakers, along with the cables we are discussing, it is about as far as it can go to being entirely consistent with brand.
That being said, I am totally pleased with the results of a single "wire product" system.
That being said, I am totally pleased with the results of a single "wire product" system.