(1 votes, average: 4.00 out of 5)
Loading...“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.”
A great write up about various tubes for home audio and guitar amps.
http://www.watfordvalves.com/cgi-bin/documents/testreport_2.pdf
(3 votes, average: 3.33 out of 5)Loading...“Low noise version of the 12AX7. These are an excellent step up from the 12AX7”
(7 votes, average: 4.29 out of 5)Loading...“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
(9 votes, average: 3.67 out of 5)Loading...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
(7 votes, average: 3.14 out of 5)Loading...
“This tube should win an award for best and worst in class… they are very musical sounding with lots of gain and a very low noise floor…” Read
“…To me the EI 12AX7 is the best production tube of this type (less colored, more defined and extended, cleaner)…” Read
(20 votes, average: 3.40 out of 5)Loading...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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(29 votes, average: 3.69 out of 5)Loading...
“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)
(10 votes, average: 4.50 out of 5)Loading...
“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
