I would say around 300 hrs for it to settle and then further smoothen out with prolonged use . I had the internals upgraded to Prime wiring from No.1 , as I was running a Origo/Prime loom at the time , have since changed to a complete Stage3 Concept loom . Do you have the option of switching your SIA-25 to a power amp and driving it with an external tube pre ? a touch of the tube with SS muscle does the trick on the Martens as far as I am concerned .
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