Have owned my Jolida for almost 3 years. Did not like the stock tubes and decided to try the 5751's and never looked back. Am currently using the Raytheon 5751 w/windmill getter. Have also tried the RCA 3 mica's and the Ge 3 mica's. I like the RCA's and the Raytheon the best. Smooths out the sound as compared to the stock tubes. Some folks have tried the Sylvania 3 mica 5751 with good results. Although I didn't like them in my system, you may also want to give them a try.
Hope this helps.
Hope this helps.