I bought an Ampeg BA115 bass amp a few months ago through Craigslist. When I went to check it out the owner told me that the only problem with it was that it pops when turning off. It actually was a pop and the sound of capacitor discharging. I was wary, but the price was good so I took it home.

Since then I've been told by several people that their amps do the same thing. One said his amp has been doing that for years and is still going strong. So far my Ampeg is working fine too except for the pop.