Telefunken 12ax7 smooth plates

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Telefunken 12ax7 smooth plates

1 Star2 Stars3 Stars4 Stars5 Stars (11 votes, average: 4.00 out of 5)
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The tube is the king of the tubes if used with care. This is superbly detailed tube with huge sound stage. Could be an overkill for a bright system, because it will make the system sound clinically bright and lifeless, but if mixed with warm sounding tubes (anything with black plates), it can produce and incredible sound that other tubes will be envious off 🙂

“Watch for the rare Telefunken smoothplates with a cloth label on the glass marked “selected tube”. Often these have red painted tips. . . These were all screened for critical use in medical equipment, with the “selected tube” or L&N versions being the best. Both red and blue tips are incredibly quiet and very three dimensional in sound.” Read

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RCA 5963 Black Plates

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RCA 5963 Black Plates

1 Star2 Stars3 Stars4 Stars5 Stars (19 votes, average: 4.16 out of 5)
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“A really fine blackplate from the 1950s, many audiophiles feel these outperform most of the other NOS 12AU7 tubes. Ranked on par with the European brands! “ Read

“Smooth and sweet, but bargain prices. Not side getter, but still has that great RCA sweet and smooth sound.” Read

“very smooth tube with no weaknesses. Very good top to bottom” Read

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RCA 5751 Black Plates Triple Mica

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RCA 5751 Black Plates Triple Mica

1 Star2 Stars3 Stars4 Stars5 Stars (15 votes, average: 4.47 out of 5)
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“These are old and fine 1950s vintage blackplates, quality on par with the blackplate RCA 12AX7 tubes, and are excellent, sweet sounding subs for the hard-to-find 12AX7. 3 mica spacers with extra side support rods, and the distinctive square getter all add up to vintage quality that will never be made again.” Read

“These are probably the best for Pink Floyd. I hate them for heavy metal though, it sounds muffled. The vocals and highs aren’t really as dynamic as with the Raytheon. Altogether, this is a nice tube for the money. It certainly beats up a lot of others I have experienced.” Read

“The RCA has a nice big and wet bass. It has a rich and creamy midrange which controls sibilants well. On the downside, brass lacks bite and dynamically, this tube sounds a little bit slow.” Read

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Raytheon 6414 Black Plates

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Raytheon 6414 Black Plates

1 Star2 Stars3 Stars4 Stars5 Stars (18 votes, average: 3.67 out of 5)
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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.”

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