Sylvania 6681/12ax7 Gray Pinched Plates

Sylvania 6681/12ax7 Gray Pinched Plates

1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 4.00 out of 5)
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“6681 was “mobile rated”, otherwise specs were per 12AX7. Mobile rated meant not only rugged and hardy in the face of repeated on-off cycles, just as stated, but also capable of performing under extreme fluctuations of filament voltage as supplied by Jeep or halftrack battery, etc. under field conditions, I believe the spec called for reliable operation w/in range exceeding 5V to 7.6V on the heater! ” Read

” big, upfront, punchy, with lots of bass.”

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Raytheon 5751 Black Plates Triple Mica

Raytheon 5751 Black Plates Triple Mica

1 Star2 Stars3 Stars4 Stars5 Stars (6 votes, average: 4.50 out of 5)
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“The strength of this tube is its overall balance. Its got the 5751 sense of focus in spades, is clean, open and evenhanded in frequency response if just a little sweet on top.” Read

“Very sweet, warm vocals. Very open soundstage. With classical, you really feel the vibration of the violin strings. It is very warm and very nice. It really gives a distance sensation.” Read

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Ken-Rad 12ax7 Black Plates

Ken-Rad 12ax7 Black Plates

1 Star2 Stars3 Stars4 Stars5 Stars (7 votes, average: 3.57 out of 5)
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GE purchased Ken-Rad (Kentucky Radio Corporation) in 1945, although tubes under Ken-Rad brand have been produced until 1951, so a lot of references are for GE not Ken-Rad

” The GE Black plate 12AX7 (and 5751) have an enchanting and beautiful sound. Articulation is excellent, though not as detailed as the TungSol. Sound stage is expansive and inclusive.” Read

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Mazda 12ax7 Chrome Plates

Mazda 1959 Chrome Plate France

1 Star2 Stars3 Stars4 Stars5 Stars (19 votes, average: 3.37 out of 5)
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Vacuum Tube Valley magazine in the 12ax7 shout out rated this tube the highest of all other tubes.

“sonicly between the Telefunken’s tremendous dynamics/speed/ details and the long plate Mullard’s/Amperex’s warmth/rich timbres/image density.” Read

“These are the best sounding 12AX7 tubes I’ve ever heard and for the price there is nothing that comes close in clairity and gain then these do in my opinion.” Store Reviews

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Raytheon 12ax7 Black Plates

Raytheon 12ax7 Black Plates

1 Star2 Stars3 Stars4 Stars5 Stars (26 votes, average: 3.69 out of 5)
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“I can’t remember who, but some here recommended that I try out a Raytheon 12AX7A in my V1 instead of the RCA I have in there. Man, am I impressed!!!” Read

” As a class of tubes, the black plate Raytheon are truly superb–equal to the best of the RCA. The Raytheon sound has a hint of darkness added to the detail.” Read (source is gone)

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Mullard 12ax7 Short Plates

Mullard 12ax7 Short Plates

1 Star2 Stars3 Stars4 Stars5 Stars (10 votes, average: 4.50 out of 5)
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“The ‘holy grail’ of NOS preamp tubes. I’d never heard one of these before, so I was interested to see what all the fuss was about, and I wasn’t disappointed. This tube gave a very warm and open clean tone, which was also very harmonically rich, with a lot of very nice ‘chimey’ overtones. Plenty of headroom to be had here. …” Read

NOS Millard and Reissue Dissection 🙂

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