Phono pre "Break-In" process? Necessary?

150 to 250 hours  for break-in is patently ridiculous…turn it on and let it warm up for a few minutes and just enjoy the thing without worrying about it…if it seems to get a little better sounding over time it could simply be due to your getting used to it, or a gift from the mysterious electron gods...but the mythology of unquantifiable extreme break in time (on for 24 hours a day 7 days straight? man….) for components is a silly concept promoted by those who are wound a little too tight. Components sound a little different from day to day anyway…earwax buildup, humidity, local electric grid fluctuations…mood swings... 

Break-in time unfortunately is a necessary evil. A freshly built amplifier will sound quite differently say.. 3 or 4 weeks later. It is centered around chemical changes that happen when power is applied to a given circuit or system to include interconnects, speaker wire etc.

Generally speaking audiophiles that recognize and hear the "break-in" effect are not imagining it - it really does happen. This is why manufacturers may have a break-in shelf for components or sub-assemblies or whole finished products that just have time put on them to try to shorten the break-in time experienced by the customer when he or she receives it in their home.

If you cannot hear the effects of break-in, it usually means that some component in your system is masking the improvement in purity.

The sonic explanation of break-in is the slow but sure improvement in apparent detail and focus of the projected sound stage due to the reduction in timing errors.

Roger

There is a break-in period for components, how much varies by manufacturer. Would suggest you ask Jolida or dealer what to expect.