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I am curious as to why Yamaha chose the volume pot and speaker selection circuit they did. If a user wants to A-B two sets of speakers, the volume adjustment for each set of speakers would be welcome, so that they can be compared at as close to the same sonic level as possible. But the...

I would like to add my voice to the need to replace the power supply board capacitors. Some classes of electric components "wear out", while others can be considered to become more reliable with age as "infant mortality" failures fall away. Electrolytic capacitors become less reliable with age...

I would suggest the Pomona 3770 series binding posts. They are gold over tellurium copper. Although tellurium sounds exotic, it is alloyed with copper to improve machinability. My experience with Pomona parts is that they are of excellent quality, and priced reasonably for that quality.