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Electro-Harmonix 12at7
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Author Archives: tubemaze
GE 5751 Gray Plates
“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
Sylvania 5751 Gold Brand Gray Plates Triple Mica
” 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
Continue readingJJ 300B
“The JJ Electronic 300B seems to have all the things i love about 300B tubes! What more can i say then that? May i humbly suggest you try the JJ Electronic 300B? You too might find yourself in love while enjoying the music.” Read
“In other words, the EAT (and JJ) veered nearly too deep into transitorized sound with the kind of material that vintage lovers would likely favor. ” Read
“Sonically this valve failed to convince, sounding bright, harsh and edgy. Soundstaging was lacking too. One positive side, the bass was quite strong and well defined but the overall tonal balance was subjectively objectionable and faintly unpleasant. ” Read
“JJ tubes are probably the smoothest sounding tubes next to NOS tubes themselves.” Read
Sylvania JHS 5751 Black Plates, 3 mica
“Wow, now here is a tube I didn’t expect to be as nice as it is, especially with the gold brand to compete with. This is a great tube, very solid buy. The dynamics are great, and they reproduce the sound very accurately.” Read
“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
CBS 12BH7 Black Plates
Great set of 12BH7 reviews here
Great replacement for any tube in 12a?7 family if your amp can handle increase heater current (600 mA )
RCA 5963 Black Plates
“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
Continue readingRCA 5751 Black Plates Triple Mica
“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
Raytheon 6414 Black Plates
“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.”