How long is the break-in time for a Sophia Electric Blue 6SN7 tube?

Tubes gradually get worse with time.

In a well designed valve system, valves work WELL until they don't.

Does that make sense? As long as they BIAS out, and have no physical problems. They work well until failure or pulled when they get close in a routine maintenance check.  If the valve needs to be balanced, and they are. Your good! 

The pin treatment thing, is always good. Just BE CAREFUL. Tube base can get hot, no excess, no drips, none of that.
Great stuff though, contact enhancement, gue.. carbon base stuff, very conductive, graphite, graphene, some type of snazzy stuff.

I use Rislone and cotton balls, and plunge the pins several time into the lightly soaked cotton wad, a light wipe, and they work perfect...Be clean don't get oil everywhere. The gue shouldn't be moved right, what happens if a valve gets bumped... weeks to settle back in... The Rislone way, plug and play, they sound good, they sound the same, until the next maint cycle. It's a mechanics way, and a very OLD way...

Regards

At 50 hours, they are sounding even better now.  Sophia said 100 hours will be the mark when they reach their best.  Sue at Sophia also told me to start shutting off the Modwright player at night so the tubes last their longest.  The 24/7 except for storms will be coming to a close it appears.

The blue SN7s are good tubes.  I bought C grade tubes, which are fine for my application.  At $99/tube, these are still pricey tubes.  I had one go bad at about 6 months.   It went microphonic an had 60 Hz hum issues.  I would not leave these tubes on 24/7.  Most of the ModWright stuff I have owned does not require a very long warm up time compared to other pieces in my system.  When possible, I turn everything on about an hour before I plan to listen and that seems to do the trick. 

My experience with Sophia tubes in general is 150 hours is the optimal point but I will admit, I have never had an amp with the 6SN7s in it.  I would trust Sue.  

Can't see any reason to leave an amp on 24/7 unless you have very restricted listening windows and you need to make every minute count.  Otherwise, you are just burning away money.  I can't speak about Modwright but my amps take 20 minutes to warm up.  

You'll notice change and settling between 100-150hrs.  No need to leave them on 24/7, and 20-30min warmup seems to be fine.  I run the former TJ Full Music 6SN7 previously noted as being one of the OEM for Sophia 6SN7s but may have changed over the past few years . They are nicer tubes than some of the other re-issues and vintage N7s I've tried, still running them now. Hope they last longer than a year or more.