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Mesa Boogie Studio 22+ 1990 - $600
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This has all brand new JJ tubes. I just used it for 2 hour band practice so that's basically all the time on the tubes. It worked fine with no issues. Once in awhile I'll hear a small crackle when I turn a knob but fine once set. One of the five band equalizers is missing one of the little tips but it functions and could probably be easily replaced. This has been used so it has cosmetic wear on the tolex as shown in the pictures. This includes an aftermarket switch which changes the channels, but it obviously isn't original.