Three reason for not remanufacturing NOS: 1) extremely limited market! Don't forget, in the tube heyday, EVERY device could only use tubes, there were no such "animals" as transistors. Now, with solid state devices, especially I.C.'s, (which can be programmed for multiple or different (applications) it would be insane for a manufacturer to design and use tube circuits for most "garbage" commercial electronics. And let's not forget about weight, bulk, lethal voltages, and power consumption when compared to solid state circuits! 2) Some of the precision manufacturing jigs do not exist anymore. Others are probably damaged. When manufacturing, one of the greatest costs can be retooling for manufacturing. 3) Rare elements necessary for the manufacture of tubes have probably become cost prohibitive when compared to prices in the '30's, '40's & '50's. Some probably are not available at the extreme purity of bygone years. Due to new workers' safety regulations, hazardous materials and manufacturing procedures used in the production of tubes cannot be approached with the same cavalier attitude as in the past. Furthermore, not every NOS tube is created equally! A good supplier of NOS tubes will have to do checking and matching (for multiple tube sets). A reputable vendor will have to trash many otherwise good tubes that are unacceptable for the high demands of audiophiles. A particularly tough tube (noisy) is the 6922 family. Personally, I would NEVER buy raw or graded tubes from an unknown Ebay source. Too much fraud & ignorance of the complexities of measuring & grading tubes. Do you really think that "Teddy Tube" who sells as a part time hobby and has a $600- worth of testing electronics can give you a quality NOS tube or matched pairs/quads/octets? Would you use a surgeon that went to a correspondence school and used a butter knife instead of a scalpel? Sometimes the least expensive turns out to be the most expensive! I HIGHLY RECOMMEND Vintage Tube Services as far and away the best supplier of quality NOS tubes. [www.vintagetubeservices.com. Tel # 616-454-3467. Andy does tubes, AND ONLY TUBES! Call him, and you will be impressed!] Tubes still have a place for radio frequencies (transistors are useless here!) and in special heating applications, where the sole purpose of the tube uses the plate (graphite) to serve as a heating element! Happy Tunes!