Depending on exactly what gets changed out, and how long they burn it in before they send it to you can make a difference. Typically, I found it can take two weeks running it all day long before things start to settle down. More than once I was told up to 200hrs on my amp/preamp when new. While others may argue more or less time, the first time you play it might sound a bit lean and harsh compared to a few weeks out when things start to gel. Have fun.
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