Ultrasonic cleaners

Any serious gotchas/unobtainium parts with respect to repairing these 1980s/90s(?) Branson ultrasonic cleaners?
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I'd like one to have around for cleaning parts in the lab but good-quality ones tend to be more than I want to spend; I probably won't use it that often, I can get a 1200 series that doesn't seem to ultrasound for a few bucks though.