Charles, it would depend on the specific design of the tube amplifier involved. A push-pull tube design which tends to cancel even order harmonics wouldn't exhibit a different spectrum of distortion components than would a similarly designed solid state unit. Amplifier tests done by SoundStage frequently demonstrate this similarity. So, the bottom line is that there doesn't necessarily have to be a "tube sound" if well-known design principles for amplification with high fidelity are followed.

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Enjoy the music, not the equipment.