I bought a used X10-D that's using Sylvania JAN 6922/6DJ8 tubes... I haven't heard it with stock tubes, but the previous owner told me the Sylvanias, which can be found on eBay for <$8, make a big improvement. However, said tubes are pretty lean-sounding. Since my X10-D is in a second system, I don't listen to it much, but if I did, I'd probably replace the tubes with something richer sounding.
Replacement tubes for MF X10-D??
I've read that the X10-D can be improved by replacing the stock tubes. My problem is that I don't remember where I read it. Does anyone have experience with this, or know where I might find out more information??