This has been my issue - and the variables go deeper than that. I bought a Fender 75 1x15 (1980's) that it turns out was modded beyond all recognition. I've bought used pedals that were modded. They don't check anything. I bought a used Mesa 5:50 Express, and it arrived without power tubes, and a missing preamp tube. I'm not going to bash GC and say I'll never go there again. But I have been finding local 'mom and pop' stores again, after not using local businesses for about fifteen years. GC has it's place, but each person needs to decide what that is for themselves. If you're going to buy a used amp from GC, be prepared to either 1) push to get them to cover the cost. I've just been through that, and I had to go to a district manager to get it done. or 2) pay to have your own tech go over it, as it probably will need it. I've never bought a used amp that wasn't in need to some work, somehow.