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Turning off tube preamp first sends solid state amp into protection?

I have been experimenting with using a vintage Luxman CL40 valve preamp as a separate preamp stage for my L-509X integrated. Because I leave the solid state amp on 24/7, I accidentally turned off the preamp while the 509X was still in Separate mode. The integrated immediately went into protection mode with the power light blinking. I powered it down into standby mode, then brought it back up and it remained in protection mode. It wasn't until I unplugged the 509X and plugged it back in that everything was cool. 

Did I do any potential damage here? What it it happens again? It's pretty easy to accidentally turn off the preamp when I'm leaving the 509X on all the time.
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Showing 1 response by arsh

arsh
367 posts
 
 I definitely agree with what some of the other folks have said here about operational sequence.  I always try to remember this about my main amplifier: “last on, first off. “
 
 I switch on everything else first and wait until it is fully powered on and only then turn on my main amplifier. When I’m done listening I switch the main amplifier off first before I switch off the other gear. 

 I hope this helps. 
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