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Questions about tubes and gear that glows. FAQ

RE: NOS = new old stock

"That could apply to new production or old production tubes."

Close, but not quite. Your definition of new is spot on - but old stock means new, unused tubes no longer in production. For instance - RCA tubes can be NOS, as can many of the famous name brands we all know. But so can Ei, Tesla, and other tubes that were produced fairly recently - but are not made anymore. Even individual tubes from a given maker can be NOS if they are not in production anymore such as the 6922 or 7591XYZ Sovtek, etc.

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