I use the Jolida FX10 in a 10" x 10" office with a pair of 87 db efficiency JohnBlue JB3 speakers and really like the combination in that room. I'm very impressed with the FX10, the soundstage and texture of the music with the JB3's is very enjoyable, sometimes even startlingly lifelike, and the FX10 has been trouble free playing several hours a day for almost two years.
I've tried several combinations of output tubes and can't comment on the longevity of the stock Electro-Harmonix tubes but as Montytx said, there are some good current production 12ax7's and EL84's available at reasonable prices. I substituted a set of Russian military 6pi14pi-ev tubes for the stock EL84's, described as a long-life tube and usually available for less then $40 for a set, and they've been rock solid.
I've tried several combinations of output tubes and can't comment on the longevity of the stock Electro-Harmonix tubes but as Montytx said, there are some good current production 12ax7's and EL84's available at reasonable prices. I substituted a set of Russian military 6pi14pi-ev tubes for the stock EL84's, described as a long-life tube and usually available for less then $40 for a set, and they've been rock solid.