Just recently had one of my amps worked on. The total came out to somewhere around $150.00, so I handed the guy $160 and told him to keep the change. It wasn't much, but I know how hard it is making a living in this business, so I thought I'd throw him a little extra. Plus, this was the first time I'd ever been in this guy's shop. The work was good and he was knowledgeable and personable, so I wanted to show my appreciation. I'll definitely be taking other amps to him. So what about you all? Do you tip your tech?