How to tell NOS from new?

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I'm looking to buy some tubes for my Jolida JD100 but I am not sure what to look for. I see you guys all talking about NOS (these are the older production ones right?) being better than new tubes. My dealer sells Sovtek, Electroharmonics, Philips, Mullards, but how do I tell if they are NOS or not? Please forgive me if that is a stupid question but I really do not know.
Thanks.

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Topic - How to tell NOS from new? - audiogremlin 15:44:52 11/09/06 (3)

Read the fine print carefully when buying NOS tubes on ebay. It's not highly unusual .... - PureAudio 12:38:03 11/10/06 (0)

Re: How to tell NOS from new? - Len_ 16:22:33 11/09/06 (1)

not all NOS tubes has new production counterparts so... - jarthel 16:38:38 11/09/06 (0)

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