Preamps have more moving parts so they tend to get more wear and tear . Designs for the most part are probably of a more simple and straightforward basis in preamps. Less is more kind of thinking. Gone are tone controls , phono options, contour buttons, high and low filters. Remote control has been the biggest addition in the preamp market. Less tuner / preamps are out there also. Amps seem more similar through the years. Binding post improvements are usually better.
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