Hi Marty, I have the Jolida 502brc. Based on my experience, I would replace the tubes, and make sure you have adequate power, ie. decent power cord, no issues with electrical system. I just added four dedicated circuits, and while doing so we noticed that the neutral return going to the pole had frayed with only a few strands intact. I don't know if it was the neutral, the dedicated circuits or the whole panel update, but wow, what a difference. I am nervous about the mods myself. If you try new tubes and don't like them, you can always put the old ones back in.
Mike
Mike