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 bought a pair of golden dragon 12ax7`s and finally got them this morning. these are the cheapest by far of all the tubes i have.

i can`t believe i`m going to say this but these have blown everything away! by quite a way too! the lack of noise floor is unbelievable! instruments come out of an inky black background and the imaging is explicit and very very vivid. everything has been pushed forward that comes out of my speakers by quite a way now. the height of the soundstage is natural height, the width goes way beyond the boundary of the side walls and there is an incredible natural sense of depth. but the soundstage is so different from all the rest of the tubes. the images seem to be carved out into the soundstage. the images are razor sharp too. these tubes are extremely explicit in the information they produce. you`re hearing everything in spades! the atmosphere they produce has to be heard to be believed! there`s one aspect of all this that really shocked me was the extra inner detail of every note coming out of every instrument in the soundstage. that blew my mind!!! and it gives the soundstage an extra dimention! it`s more like 4d!

when i mentioned that these tubes are explicit in the detail they drag up, don`t go thinking they`re cold sounding, they have a natural warmth and they are smooth as hell. cymbals sound just like cymbals in all their glory. the extra detail on offer from dave gilmours guitar on the track "where we begin" is nothing short of stunning sounding! extremely expressive! there`s so much more life to everything i hear and everything sounds so natural and real. there`s a natural rawness on offer that gives the sensation of the performer actually standing there in front of you and the same goes for every other instrument in the soundstage. you can pick out any instrument you like in the soundstage and follow it with the greatest of ease and that instrument will be there in it`s own spot in the sounstage with so much air around it. the seperation of instruments is truly jaw dropping! voices sound just about as realistic as you can get!

i have to say the improvement over the telefunkens is stunning and the telefunkens are excellent in their own right. these golden dragons produce a soundstage that is so different from all the other tubes i have heard and they sound so alive.

i cannot believe the difference in sound and for such little money. my system sounds spectacular!
Grayf
Thanks for really messing me up!! The Golden Dragons are what came in my pre. The strengths you describe do sound spot on to what I hear. If you were to move just a click to the warm side with the strengths of the G/Ds...what tube comes to mind??
hiya mac i`m really not sure. at a guess i`d say mullards. the reason i say that is because i read somewhere that these golden dragons are based on the mullards, but i don`t have any experience with mullard tubes although they are on the list of "to get" tubes. i`ve been looking into mullard tubes with the blackburn codes on them. they`re supposed to be the ones to go for. mullards are supposed to have a beautiful warmth allied to great detail. these golden dragons sound like nothing i`ve heard before!
I am gonna try the Amperex bugle boy 12at7 in place of the Golden Dragon 12at7's that came in my pre.
Any thoughts or experience with these?
No experience with those tubes, but I just put Amperex NOS Bugle Boys12AU7s in my Primaluna Dialogue1 and Wow! Wow! Wow! Just like the old song, "What a Difference a Day Makes," what a difference a tube makes! Huge well- layered sound stage. Tone, timbre, airy, clear, detailed yet sweet, fuller with more weight, I'm really enjoying the overall musicality of these tubes. Now, I must find another pair of these for backup. These replaced RCA Clear Top Side getter which were very good. Also put in Yugoslavian Telefunken 12AX7s, slightly bettered the the Canadian NOS Telefunken 12AX7s rebranded Northern Electric that they replaced.