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New to tubes-what the heck does NOS mean?

I checked 50 posts in the forum and saw many references to "NOS" but didn't see what it stands for. Tell me please?
Also, any opinions on good values in EL34 tubes? I've read some good things about EH (Electro-Harmonix) being a good output tube VALUE. Your comments based on actual listening experiences are appreciated.
Thanks and happy listening!
myraj

Showing 1 response by marakanetz

marakanetz's avatar
marakanetz
5,473 posts
 
eh el34 tubes are exact replica of mullards but much cheaper and affordable. they're made in russia, have an outstanding longetivity and quality.
sonically they're softer than svetlana but have greater and deeper bass.
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