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I think the single most revealing source is a grand piano. Put a small omni condenser on it (like an Avenson) a few feet above the hammers and let a good, dynamic player do the rest. That's a great way to judge tonality, transient response, and headroom. Choosing a microphone with low output impedance that is relatively impervious to loading will allow you to parallel at least a couple of different preamps at once so you can make a direct comparison of the exact same performance through the same mike in the same location, into two or more different preamps.
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