I would retube the unit. Try thetubestore.com fast friendly quick service large selection lots of tube info. I am also new to tubes and use cj equipment. I have had a couple of defective tubes; one burned out and the other was very noisey. So when to replacement was easy. I do not know anything about Jolida equipment you may want to write or call them. If they are anything like cj they will be more than happy to answer your questions.
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