Tubes I've rolled in the JD-100:
Sylvania JHS Gold Label 5751WAs (I finally settled on using these, very palpable 3D sound, wonderfully detailed, etc. - great but pricey tubes); the stock Jolida 12AX7s (ech!); Sovtek 12AX7LPS (not a good fit for the JD-100)); GE JAN 5751 blackplates (ok, liked them better than the Sovteks); two pair of GE JG 5751 triple mica blackplates (very good tubes, could have stayed with these had I not tried the Sylvania tubes); Fisher-branded Telefunken and Amperex 12AX7s (not a good match with this unit, sd nonr of the 12XA7s seem to bring out the detail in a realistic fashion, the Sylvania just crushes in this regard.).
FYI - I also upgraded the PC to a cryoed VH Audio Flavor 1, which bolsters the bottom end of the JD-100. Furthermore, I use Walker SST on the tube pins-RCA connectors-IEC-PC, which enhanced the amount of detail provided by the unit. Also use Herbie's Hal-O 9 tube dampers. Unit rests on a 22 lb. granite slab supported by Vibrapods. Also has a 12 lb. piece of marble on the top resting on coasters.
YMMV.
