“I do believe I’m in love. The Raytheon black plate 3 mice (1961)
is truly wonderful. I do like it better even than a GE BP 3-mica (1957).
clarity, dynamics, bass. yum.”
” Sweet and smooth Raytheon 5751 tubes with the rare four bladed windmill shape top getter. Rich and smooth tone with quiet background.” Read
“This Russian tube is full bodied and bright with a more straightforward presentation. It packs a lot of bite with its higher than normal gain.” Read
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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)
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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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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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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“very quiet and tame medium gain tube. These were very well constructed back in the day and will provide hours and hours of vintage tone.”
“It is a great sounding tube, with wonderful air and detail. Helically-wound filaments for low hum and is quieter and more consistent than the ones they had partially assembled overseas later. If you want one of the better sounding 12AX7’s ever made and don’t want to pony up the big bucks for the Tele’s and so on, this is it!” Read
“Will outlast and outperform any of the current production crap! These are Joint Army-Navy tubes, USA made, and are a BARGAIN right now.” Read
” I love em, especially if an amp is prone to fizz or brittleness in the crunch, they will smooth it out, but its not like drastically reducing the gain so its a nice compromise” Read
“GE Triple Mica 5751 is absolutely unbeatable in the line stage of any Fisher that uses 7591 or 7199 output tubes, but not for 7868 output tubes” Read
” To my ears it is the the 2nd or 3rd best 5751 ranking up there with the Sylvania & GE black plates. Its strength is its midrange, but it may also be its weakness. The mids here are full, lush, tangible and maybe (just maybe) a trifle overblown. Occasionally i find the lush full vocals obscure just a bit of detail and reduce transparency slightly, but the mids are so lush I could understand how you might not care. ” Read
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