12ax7 vs 5751


hi all,
i need some advice. i`m very new to tube amplifiers and i`ve been doing some tube rolling.

i currently have a pair of grant fidelity matched psvane 12ax7t`s in my amp which sound fantastic.

what i`d like to know is which are the better tubes, 12ax7`s or 5751 tubes. i`ve been looking at forums and there are folk out there that say 5751 tubes are better than 12ax7 tubes.

can i have your thoughts on this please and also which are the good 5751`s to go for.

i really like the psvanes but if they can be bettered i`d go for it as my next line up of replacement tubes.

my amp is a yaqin mc100b. the tubes i have installed at the moment are.....
2 x psvane 12ax7t`s
2 x brimar 6sn7gty/cv1988`s
2 x sylvania 6sn7gtb`s
4 x electro harmonix kt88eh`s

many thanks in advance guys.
grayf
hiya all,

i`m drawing a line under breaking in the kt88`s. i`m really not hearing any changes in sound now. there may be changes but my ears cannot hear those differences and i`m extremely happy with what i am hearing! plus 300 hours is a lot of breaking in!!!

with that said, i tried out the jan phillips 5751`s today. very very nice sound. extremely clear, pin point soundstage. the bass is very deep and clear. there`s no added warmth at all that i can detect anywhere. these tubes make sense of complex guitar lines in the soundstage. there`s also nice depth to the soundstage too. i do prefer the extra warmth some tubes give but i wouldn`t be disappointed with these in my amplifier.

jbs and mechans, you`re dead right! i absolutely love the telefunkens. they tick so many boxes and they`re a very addictive sound. the ei elites are along the same lines as well as the psvanes. mechams are you psychic??? my investigations have lead me to the raytheon windmill getter 5751`s!!! been looking at them all day online! i can`t afford them right now but they`re on my "to get" list! as are the sylvania`s. i`ve had a load of bills come through so i`m going to have to abandon getting any expensive tubes for a good while to come. mechans, your info on the raytheons and how they sound has really stood out to me. i love strong presence in the soundstage. once i get my finances straight again i`ll be looking into those and the sylvania`s and the other odd thing is i was thinking about getting single tubes today too! spooooky!!!
oh i forgot to mention (yet again as usual lol) i did order a pair of 12ax7`s earlier today. very cheap too! i ordered a pair of golden dragon 12ax7`s. heard some very good things about these and they`re the second cheapest tubes i`ve ordered too! i should have them within 48 hours so i`ll let you all know how they sound.
oops need to correct a mistake! the chinese dragons are ecc83t`s the "t" standing for trustworthy
I have the golden dragon 12at7's as the stock Thor tubes.

What is the difference between 12at7 and 12ax7 ?
What is the difference between 12at7 and 12ax7 ?
I asked Brent Jessee that question but added the 12au7 also. He said the 12ax7 has the highest gain followed by the 12at7 then the 12au7.