Since the Jolida has a tube output stage, I would start with replacing the tubes - especially if you are still using the stock tubes. Contact some of the reputable tube dealers (such as Vintage Tube Services, Tube Depot or Upscale Audio, etc.) and get a replacement pair that has been tested for low noise/microphonics. Based on my experience with the Jolida (as well as many others - check the archives), I would suggest trying a pair of 5751's as opposed to the 12AX7's. I was using some GE Jan 5751's that sounded great and were relatively inexpensive.
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