Back in the 90s, I bought a number of these ECC83s from Centre Electronics in Birmingham (UK). They are NOS (plain white boxes), apparently Yugoslavian, and look a little like Mullards. They have an ‘O‘-getter. I wonder if they might be Ei? Any ideas?
Sound is both warm and detailed.
Labels wipe off very easily (in fact, it happened during photographing - see lower code)...
My guess would be EI. They look a lot like Telefunken smooth plates which the EIs were patterned after and actually manufactured with Telefunken tooling (I don't see the Telefunken diamond pattern on bottom of tube however which would definitely point to these being EIs). They can be noisy but if you have good examples they are very good sounding tubes indeed. Smooth but detailed is exactly how I would describe the Tele and EI smooth plates. They are among my favorites of true ECC83/12AX7 tubes (do prefer the American manufactured triple mica 5751s in this family of tubes however). Very good tube either way. Enjoy!
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