It's also about perception, which is hard to look past. If everyone says the old tubes sound better than the new ones, then people who are thinking about making new tubes are in a hole even before they start. In the audio world logic, the higher the price, the better sound; the older the tube the better it's made.
Companies such as CAT, ARC, Berning, Cary, etc., put out excellent products without a single NOS tube. Simple reason is that NOS tubes are inconsistant in quality and unpredictable in supply - the death knell of a manufacturer. Tighter tolerances and quality control cause these guys to throw out tubes that beat their NOS thousand-dollar-a-pair-on-ebay counterparts.
The quality tubes are there, but they come packaged with the rest of the product as they are an intergral part of the sound.
Companies such as CAT, ARC, Berning, Cary, etc., put out excellent products without a single NOS tube. Simple reason is that NOS tubes are inconsistant in quality and unpredictable in supply - the death knell of a manufacturer. Tighter tolerances and quality control cause these guys to throw out tubes that beat their NOS thousand-dollar-a-pair-on-ebay counterparts.
The quality tubes are there, but they come packaged with the rest of the product as they are an intergral part of the sound.