is using a tube amp every day bad?

If its an older amp just make sure the filter capacitors in the power supply have been sorted out. If they are failing they can take the power transformer with them and that's not pretty.

I wouldn't worry as much about the tubes!

@atmasphere Thanks!

If it is an old blackface Fender geetar amp, I will take if off your hands no questions asked.

bad

bad 

very bad

bad boy

very bad boy

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is this a serious question?  

@bigkidz nope.