I am always impressed that they (well some tubes) can hold their tolerances sample to sample as well as they do.
Tom
Hello, Myles. A friend of mine passed this video on to me and it's right up the alley with this thread. It's an old school film, thought you might enjoy it. [33 minutes long, FYI so reserve some time to watch it in its entirety]
http://www.mullardtubes.com/Video.aspx
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