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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 2 responses by imhififan

imhififan's avatar
imhififan
2,105 posts
 
It’s pretty easy to accidentally turn off the preamp when I’m leaving the 509X on all the time.
My suggestion is use a IR remote controlled plug/outlet for the CL40 valve preamp and a remote control with macro, program a set of command sequence to turn off the CL40 valve preamp:
Mute the L-509X, change the input out of HT bypass, power OFF the remote controlled plug/outlet for the CL40 valve preamp.
To turn on the CL40 valve preamp:
Mute the L-509X, change the input out of HT bypass, power ON the remote controlled plug/outlet for the CL40 valve preamp, change the input to HT bypass, un-mute.
imhififan's avatar
imhififan
2,105 posts
 
wolf_garcia4,373 posts11-18-2018 11:12am
Always turn the preamp on first and off last, although with many modern systems it might not matter much...but that's been the conventional wisdom for a while.
jeenam50 posts11-19-2018 10:06pm
smh @ wolf_garcia. Do not listen to his awful advice.

ALWAYS power the amp on last!
ALWAYS power the amp off first!
@jeenam, Your advice absolutely correct, btw, wolf_garcia is right too.
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