Nandric:
I'm not clear, on what aspects makes one tube superior to another. You read about NOS (new old stock) being the best. It would seem with technology being so much better in our modern times, a superior new stock tube could be manufactured. My guess is the market isn't strong enough. Tube suppliers, such as Andy's Vintage Tubes, measure and match tubes, based on their measurements.
I'm not clear, on what aspects makes one tube superior to another. You read about NOS (new old stock) being the best. It would seem with technology being so much better in our modern times, a superior new stock tube could be manufactured. My guess is the market isn't strong enough. Tube suppliers, such as Andy's Vintage Tubes, measure and match tubes, based on their measurements.