Is it a general rule to burn them in for a few hundred hours? I have found that the handful of CD players (or DAC/Transport combos) I've owned seem to get better, especially in the frequency extremes (more control, less boom or sizzle).
Buconero, I had my SACD player upgraded and when I played it It sounded dull and dark. After a 100 hours it opened up. The new tubes had to burn in as well. Mike
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