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.
Jolida JD100 noise issues
Through my experiments I found that the Jolida seems to give off a lot of noise. To explain further I usually do noise floor test by putting my amp full blast with nothing playing to here the noise floor. I found a rough sounding hiss. So what I did is turn off the Jolida and did the same thing and found the hiss was gone. Then I turned on the the Jolida (turning the volume always to 0 before any changes) and found the hiss wasn't there. So I thought maybe it was gone. UNTIL I put a cd in it and once it read the cd the hiss was back. I've tried this with numerous cd's and also different tubes, same hiss. I was wondering if anyone else found this to be and is there any way to remedy this... Thanks JohnnyP.
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