This amp is WAAAAYYY too new for you to "need to retube it". I presume you did not leave it on 24/7. You should REALLY look into that. If nothing else, the Chinese tubes last a LONG time in a Jolida. This is the first JD1000 that I have heard of needing a retube(have yet to retube any). If you are retubing for better sound, I can understand it. OK, on to the retube... First, STAY AWAY FROM THE STOCK CHINESE TUBES!!! The smaller tubes may be replaced with ANY European tube. All will be significant in improving on the detail, openess, and quietness of your amp. I have found to get good sound from Ei. There are only two output tubes I recommend. The Svetlana EL34 and the JJ(formerly Tesla/Teslovak) E34L. The Svetlana are warmer and more subtle. Very classic tube. The JJ are more open, dynamic, and extended(at both frequency extremes). Will also offer you a bit more power, but that's not really an issue with this amp, with its 8 output tubes. I would say which one would depend on your tastes in sound and in the music you listen to. Either of these two output tubes will drastically improve the sound. EVERYTHING will open up. The amp will become MUCH faster, detailed, neutral, and extended(at both frequency extremes). It will seem like you just removed a blanket from your speakers. While you are at it, replace the power cord. Nothing extreme, spend $100 to $200 for a used one here on Audiogon. Go for a large guage cord. Bass response, focus, detail, and blackness will all be helped. Good Luck!