Question about valves running hours


I'm new to the tubes world and when I bought my amplifier the seller told me not to run it for more than 8 hours, letting it for rest a couple hours before the next listening session. I wasn't told why, but now I got curious and I want to know more about it. 
What's the reason for this limitation? What can we damage and why?
128x128migueca

Showing 1 response by reynolds853

The owner's manual for my tube amplifier advises that to increase tube life that it not be left running for more than an hour if it is not being used. Along the same line, a comment made in the owner's manual for my (tube-based) media player is that unlike solid state players tube output stage players should be shut down when not being used.  This will greatly prolong tube life.