Hi Folks, in another thread I read that tube amps have to be serviced like every 10 or 15 years. Not only the power amp tubes should have to be changed but also some other parts. My Blues Jr. is like 10 or 12 years old now. I have the impression that lately it sounds a bit compressed and has less volume than it used to have. Time to change power amp tubes? Can i do this myself (what tubes would I have to buy?) or does it need to go to a tech? Also – given the age of the amp – is it time for a full service by a tech?