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NOS Tubes inferior?

Recently new to tubes I am looking down the road to replace the tubes in my cj ls17. I was advised to look at NOS tubes vs. ordering a new set from conrad-johnson. Another friend suggested that tubes made today employ better technology and therefore are better than NOS; furthermore he stated that since glass is not 100 percent impermeable old tubes have lost some 'vacuum'. Any thoughts on this argument? Are NOS the way to go and are they worth the cost?
jbecker

Showing 1 response by sugarbrie

sugarbrie
3,854 posts
 
If you like the sound of your CJ preamp as it is now using the stock tubes, then buying their replacement tubes will preserve that same sound.

NOS tubes should probably be tested to make sure they are still good. There is no general answer. There are some great sounding NOS tubes, and some great new tubes like the Russian made 12AX7LPS.

Anyway; the brand of NOS tubes you are most likely to hear about are going to be the good ones.

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