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Questions about tubes and gear that glows. FAQ

RE: Pinging airtime and others regarding the 12au7 and its favored/disfavored applications

Both Morgan Jones in his book "Valve Amplifiers" and Eric Barbour in "Vacuum Tube Valley" found that the 12AU7 has significantly more 2nd harmonic distortion than many of the other low mu triodes such as the 6SN7, 5687, 76 and 12SN7. Personally, I use the 1950s TungSol 5687, although others have their favorites. The 76 family are all low distortion and popular with builders of audio equipment. Read "Valve Amplifiers" for an education in vacuum tubes. The link to the VTV article is below.


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