I have a stereo mesa power amp, but only use one channel. Is it ok if I pull the tubes out of the unused channel to give them extra life or will the amp not function if I do that? Thanks
I'd check the owners manual and if that doesn't answer your question then I'd email Mesa.
I don't give a shit if you listen to me or not
Product manual says that you can take a tube off in case of failure and keep on playing.

Mesa website says that, when using a stereo power amp in mono, you should alternate channels to give the tube similar use time.

So that doesn't really help me.