When I purchased my ARC Classic 60 many moons ago I kept the bias data that ARC so graciously supplied. When it was time to retube I purchased the tubes from ARC and requested tubes with the same or as close the data on the origionals. ARC did a great job doing this and it came at a premium but all I need to do was plug them in, burn them in and I was all set. If you kept your data maybe your manufacturer will do the same.
How to test those NOS tubes
After many decades of audiophilia nervosa und some years of tube rolling, I've finally bought myself a nice WE Tube Checker to try to measure and match those critters myself. Since I'm an absolute greenhorn in this game, what are the main parameters I must look out for? How do I test for noise for example ? Is there a site, which helps newbees like me? Are there books I should be on the look out for? Could anybody tell me the basics? Any help is greatly appreciated. Thanks in advance!