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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“Regardless of what the Telefunken 12AT7s went into, they sounded consistent. The first thing people notice is that treble instruments are placed far back in the soundstage. In several rooms and systems, the hi hat on Peter Gabriel’s “Red Rain” and cymbals from Megadeth’s “Disconnect” were placed behind the plane of the speakers.” Read
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“An industrial, computer rated dual triode… This tube is also like a 12AV7 and will work wonders in any 12AT7 spot, and may be just the ticket if you want to boost the gain of a 12AU7 circuit” Read
“6414’s are still used by MANLEY in some of their tube pro (studio) gear and also in some VTL amps, thus this tube should have some audio merits. Certainly worth a try.”
