“…replaced the Tellies with the 5751’s and the screen was removed, I was able to stick my head out of the window and clearly see to the left and right. ” Read
It is a common myth in the audiophile world that tubes manufactured on the same tooling will sound identical regardless of where they were pressed. After experimenting with EI 12ax7s built on Telefunken equipment—which proved to be a far cry from the originals—I decided to put Mullard’s 12ax7 global production to the test.
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EIA (Electronic Industries Association) codes you might find on a tube. A great resource to have when the original logo is gone or you have a generic logo (remarketed). See the post for all the codes
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